Missing buttons in Firefox and Chromium

System Information

Nextcloud version ( 16.0.3):
Operating system and version (Raspbian GNU/Linux 10 (buster)):
Apache version (Apache/2.4.38 (Raspbian)):
PHP version (7.3):

My safety and facility warnings are are (translated GER - EN):

Your data directory and files are probably accessible from the Internet. The . htaccess file does not work. It is strongly recommended to configure your web server so that the data directory is no longer accessible from the Internet or that you move it out of the document root directory of the web server.

SQLite is used as a database. For larger installations it is recommended to switch to a different database backend. This is especially recommended when using the desktop client for synchronization. To migrate to another database, please use the command line: 'occ db:convert-type'';, or refer to the documentation.

The PHP memory limit is below the recommended value of 512MB.

Your web server is not configured correctly to resolve "/.well-known/caldav". For more information, see the documentation.

Your web server is not configured correctly to resolve "/.well-known/carddav". For more information, see the documentation.

No PHP memory cache has been configured. A memory cache can be configured to increase performance. For more information, see the documentation.

The output of my Nextcloud log in Admin > Logging:

{"reqId":"qHkxaYdSarbCqjDnwcbE","level":4,"time":"2019-10-31T09:12:28+00:00","remoteAddr":"193.158.97.194","user":"Admin","app":"files_texteditor","method":"PUT","url":"\/nextcloud\/index.php\/apps\/files_texteditor\/ajax\/savefile","message":"File: \/Urlaub 2020.txt modified since opening.","userAgent":"Mozilla\/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit\/537.36 (KHTML, like Gecko) Chrome\/70.0.3538.102 Safari\/537.36 Edge\/18.18362","version":"16.0.3.0"}
{"reqId":"uIqDPiUzrzQAJWK6beNy","level":4,"time":"2019-10-31T09:12:31+00:00","remoteAddr":"193.158.97.194","user":"Admin","app":"files_texteditor","method":"PUT","url":"\/nextcloud\/index.php\/apps\/files_texteditor\/ajax\/savefile","message":"File: \/Urlaub 2020.txt modified since opening.","userAgent":"Mozilla\/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit\/537.36 (KHTML, like Gecko) Chrome\/70.0.3538.102 Safari\/537.36 Edge\/18.18362","version":"16.0.3.0"}
{"reqId":"yu33lm0nP84URMkcud70","level":4,"time":"2019-10-31T09:12:31+00:00","remoteAddr":"193.158.97.194","user":"Admin","app":"files_texteditor","method":"PUT","url":"\/nextcloud\/index.php\/apps\/files_texteditor\/ajax\/savefile","message":"File: \/Urlaub 2020.txt modified since opening.","userAgent":"Mozilla\/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit\/537.36 (KHTML, like Gecko) Chrome\/70.0.3538.102 Safari\/537.36 Edge\/18.18362","version":"16.0.3.0"}
{"reqId":"NbP5ipe8gY9ZShKRF7zP","level":4,"time":"2019-10-31T09:12:34+00:00","remoteAddr":"193.158.97.194","user":"Admin","app":"files_texteditor","method":"PUT","url":"\/nextcloud\/index.php\/apps\/files_texteditor\/ajax\/savefile","message":"File: \/Urlaub 2020.txt modified since opening.","userAgent":"Mozilla\/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit\/537.36 (KHTML, like Gecko) Chrome\/70.0.3538.102 Safari\/537.36 Edge\/18.18362","version":"16.0.3.0"}
{"reqId":"kJ5wPR9umzgNkp4jgXf3","level":4,"time":"2019-10-31T09:17:59+00:00","remoteAddr":"193.158.97.194","user":"Admin","app":"files_texteditor","method":"PUT","url":"\/nextcloud\/index.php\/apps\/files_texteditor\/ajax\/savefile","message":"File: \/Urlaub 2020.txt modified since opening.","userAgent":"Mozilla\/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit\/537.36 (KHTML, like Gecko) Chrome\/70.0.3538.102 Safari\/537.36 Edge\/18.18362","version":"16.0.3.0"}
{"reqId":"ZqfS5OqtROZhSUXFhwmr","level":4,"time":"2019-10-31T09:18:04+00:00","remoteAddr":"193.158.97.194","user":"Admin","app":"files_texteditor","method":"PUT","url":"\/nextcloud\/index.php\/apps\/files_texteditor\/ajax\/savefile","message":"File: \/Urlaub 2020.txt modified since opening.","userAgent":"Mozilla\/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit\/537.36 (KHTML, like Gecko) Chrome\/70.0.3538.102 Safari\/537.36 Edge\/18.18362","version":"16.0.3.0"}
{"reqId":"oXxaxKyvJW4nLWoRCX9J","level":4,"time":"2019-10-31T09:18:07+00:00","remoteAddr":"193.158.97.194","user":"Admin","app":"files_texteditor","method":"PUT","url":"\/nextcloud\/index.php\/apps\/files_texteditor\/ajax\/savefile","message":"File: \/Urlaub 2020.txt modified since opening.","userAgent":"Mozilla\/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit\/537.36 (KHTML, like Gecko) Chrome\/70.0.3538.102 Safari\/537.36 Edge\/18.18362","version":"16.0.3.0"}
{"reqId":"76Zw6sYxSjAxS3SaSWrg","level":4,"time":"2019-10-31T09:18:08+00:00","remoteAddr":"193.158.97.194","user":"Admin","app":"files_texteditor","method":"PUT","url":"\/nextcloud\/index.php\/apps\/files_texteditor\/ajax\/savefile","message":"File: \/Urlaub 2020.txt modified since opening.","userAgent":"Mozilla\/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit\/537.36 (KHTML, like Gecko) Chrome\/70.0.3538.102 Safari\/537.36 Edge\/18.18362","version":"16.0.3.0"}
{"reqId":"XssByW628c1hTgIJBk3M","level":4,"time":"2019-10-31T09:18:30+00:00","remoteAddr":"193.158.97.194","user":"Admin","app":"files_texteditor","method":"PUT","url":"\/nextcloud\/index.php\/apps\/files_texteditor\/ajax\/savefile","message":"File: \/Urlaub 2020.txt modified since opening.","userAgent":"Mozilla\/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit\/537.36 (KHTML, like Gecko) Chrome\/70.0.3538.102 Safari\/537.36 Edge\/18.18362","version":"16.0.3.0"}
{"reqId":"OXMMuayjpZ68N95IwNUP","level":4,"time":"2019-10-31T09:19:46+00:00","remoteAddr":"193.158.97.194","user":"Admin","app":"files_texteditor","method":"PUT","url":"\/nextcloud\/index.php\/apps\/files_texteditor\/ajax\/savefile","message":"File: \/Urlaub 2020.txt modified since opening.","userAgent":"Mozilla\/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit\/537.36 (KHTML, like Gecko) Chrome\/70.0.3538.102 Safari\/537.36 Edge\/18.18362","version":"16.0.3.0"}
{"reqId":"iEZsJLoNdjP71nuwMZbn","level":2,"time":"2019-11-03T18:54:33+00:00","remoteAddr":"84.63.172.246","user":"--","app":"core","method":"POST","url":"\/nextcloud\/index.php\/login","message":"Login failed: 'MonaH' (Remote IP: '84.63.172.246')","userAgent":"Mozilla\/5.0 (Linux; Android 9; SAMSUNG SM-A705FN) AppleWebKit\/537.36 (KHTML, like Gecko) SamsungBrowser\/10.1 Chrome\/71.0.3578.99 Mobile Safari\/537.36","version":"16.0.3.0"}
{"reqId":"Cs9y6tBzrbgKdPXGr7Qj","level":3,"time":"2019-11-08T23:47:56+00:00","remoteAddr":"90.186.134.10","user":"Clarissa","app":"PHP","method":"POST","url":"\/nextcloud\/index.php\/login\/v2\/grant","message":"Undefined index: urlGenerator at \/var\/www\/cloud\/nextcloud\/core\/templates\/loginflowv2\/done.php#29","userAgent":"Mozilla\/5.0 (Windows NT 10.0; Win64; x64; rv:70.0) Gecko\/20100101 Firefox\/70.0","version":"16.0.3.0"}
{"reqId":"i591gNm8RKcHxZWImH0D","level":2,"time":"2019-11-13T19:52:56+00:00","remoteAddr":"90.186.134.10","user":"--","app":"core","method":"POST","url":"\/nextcloud\/index.php\/login","message":"Login failed: 'Admin' (Remote IP: '90.186.134.10')","userAgent":"Mozilla\/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit\/537.36 (KHTML, like Gecko) Chrome\/70.0.3538.102 Safari\/537.36 Edge\/18.18362","version":"16.0.3.0"}
{"reqId":"iliGcL1d8UYWnNSC5yZN","level":3,"time":"2019-11-13T19:54:43+00:00","remoteAddr":"90.186.134.10","user":"Admin","app":"onlyoffice","method":"PUT","url":"\/nextcloud\/index.php\/apps\/onlyoffice\/ajax\/settings\/address","message":"HealthcheckRequest on check error: cURL error 7: Failed to connect to onlinedocs.onlyoffice.com port 443: Keine Route zum Zielrechner (see http:\/\/curl.haxx.se\/libcurl\/c\/libcurl-errors.html)","userAgent":"Mozilla\/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit\/537.36 (KHTML, like Gecko) Chrome\/70.0.3538.102 Safari\/537.36 Edge\/18.18362","version":"16.0.3.0"}
{"reqId":"MyWisjmaZ5MpOBO8CqkK","level":2,"time":"2019-11-13T19:56:46+00:00","remoteAddr":"90.186.134.10","user":"--","app":"core","method":"POST","url":"\/nextcloud\/index.php\/login","message":"Login failed: 'Admin' (Remote IP: '90.186.134.10')","userAgent":"Mozilla\/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit\/537.36 (KHTML, like Gecko) Chrome\/70.0.3538.102 Safari\/537.36 Edge\/18.18362","version":"16.0.3.0"}
{"reqId":"1PC9ZSmNXiYdPNqXwETd","level":2,"time":"2019-11-21T10:13:59+00:00","remoteAddr":"185.155.191.204","user":"--","app":"core","method":"POST","url":"\/nextcloud\/index.php\/login","message":"Login failed: 'Admin' (Remote IP: '185.155.191.204')","userAgent":"Mozilla\/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit\/537.36 (KHTML, like Gecko) Chrome\/70.0.3538.102 Safari\/537.36 Edge\/18.18362","version":"16.0.3.0"}
{"reqId":"WoctLblfp2vvg69LPMZD","level":2,"time":"2019-11-23T17:04:12+00:00","remoteAddr":"90.186.241.108","user":"Admin","app":"core","method":"PROPFIND","url":"\/nextcloud\/remote.php\/dav\/files\/Admin\/","message":"Login failed: 'Admin' (Remote IP: '90.186.241.108')","userAgent":"Mozilla\/5.0 (Windows) mirall\/2.6.1stable-Win64 (build 20191105) (Nextcloud)","version":"16.0.3.0"}
{"reqId":"ouQwvKBRYCvmY34dkTWu","level":3,"time":"2019-11-26T16:29:51+00:00","remoteAddr":"90.186.241.108","user":"Admin","app":"jsresourceloader","method":"GET","url":"\/nextcloud\/index.php\/apps\/announcementcenter\/","message":"Could not find resource js\/oc-backbone-webdav.js to load","userAgent":"Mozilla\/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit\/537.36 (KHTML, like Gecko) Chrome\/80.0.3965.0 Safari\/537.36 Edg\/80.0.334.3","version":"16.0.3.0"}
{"reqId":"ouQwvKBRYCvmY34dkTWu","level":3,"time":"2019-11-26T16:29:51+00:00","remoteAddr":"90.186.241.108","user":"Admin","app":"jsresourceloader","method":"GET","url":"\/nextcloud\/index.php\/apps\/announcementcenter\/","message":"Could not find resource vendor\/select2\/select2.js to load","userAgent":"Mozilla\/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit\/537.36 (KHTML, like Gecko) Chrome\/80.0.3965.0 Safari\/537.36 Edg\/80.0.334.3","version":"16.0.3.0"}
{"reqId":"ouQwvKBRYCvmY34dkTWu","level":3,"time":"2019-11-26T16:29:54+00:00","remoteAddr":"90.186.241.108","user":"Admin","app":"cssresourceloader","method":"GET","url":"\/nextcloud\/index.php\/apps\/announcementcenter\/","message":"Could not find resource vendor\/select2\/select2.css to load","userAgent":"Mozilla\/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit\/537.36 (KHTML, like Gecko) Chrome\/80.0.3965.0 Safari\/537.36 Edg\/80.0.334.3","version":"16.0.3.0"}
{"reqId":"FFCIt1xsXkITuvMZOVfF","level":3,"time":"2019-11-26T16:32:53+00:00","remoteAddr":"90.186.241.108","user":"C9CT1","app":"jsresourceloader","method":"GET","url":"\/nextcloud\/index.php\/apps\/announcementcenter\/","message":"Could not find resource js\/oc-backbone-webdav.js to load","userAgent":"Mozilla\/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit\/537.36 (KHTML, like Gecko) Chrome\/80.0.3965.0 Safari\/537.36 Edg\/80.0.334.3","version":"16.0.3.0"}
{"reqId":"gR8Wf5nwy4vfK9MMse7f","level":4,"time":"2019-11-26T16:35:17+00:00","remoteAddr":"90.186.241.108","user":"C9CT1","app":"webdav","method":"PUT","url":"\/nextcloud\/remote.php\/dav\/addressbooks\/users\/C9CT1\/contacts\/F4F699CC-9C88-4D37-AF88-BE0287667759.vcf","message":{"Exception":"Sabre\\DAV\\Exception\\BadRequest","Message":"VCard object with uid already exists in this addressbook collection.","Code":0,"Trace":[{"file":"\/var\/www\/cloud\/nextcloud\/3rdparty\/sabre\/dav\/lib\/CardDAV\/AddressBook.php","line":144,"function":"createCard","class":"OCA\\DAV\\CardDAV\\CardDavBackend","type":"->","args":["7","F4F699CC-9C88-4D37-AF88-BE0287667759.vcf","BEGIN:VCARD\r\nVERSION:4.0\r\nPRODID:-\/\/Nextcloud Contacts v3.1.5\r\nUID:e9a89eef-2d85-438a-ade1-300435578c0f\r\nREV;VALUE=DATE-AND-OR-TIME:20191126T163516Z\r\nFN:Erik Nelius\r\nADR;TYPE=HOME:;;;;;;\r\nEMAIL;TYPE=HOME:\r\nTEL;TYPE=\"HOME,VOICE\":\r\nEND:VCARD\r\n"]},{"file":"\/var\/www\/cloud\/nextcloud\/3rdparty\/sabre\/dav\/lib\/DAV\/Server.php","line":1096,"function":"createFile","class":"Sabre\\CardDAV\\AddressBook","type":"->","args":["F4F699CC-9C88-4D37-AF88-BE0287667759.vcf","BEGIN:VCARD\r\nVERSION:4.0\r\nPRODID:-\/\/Nextcloud Contacts v3.1.5\r\nUID:e9a89eef-2d85-438a-ade1-300435578c0f\r\nREV;VALUE=DATE-AND-OR-TIME:20191126T163516Z\r\nFN:Erik Nelius\r\nADR;TYPE=HOME:;;;;;;\r\nEMAIL;TYPE=HOME:\r\nTEL;TYPE=\"HOME,VOICE\":\r\nEND:VCARD\r\n"]},{"file":"\/var\/www\/cloud\/nextcloud\/3rdparty\/sabre\/dav\/lib\/DAV\/CorePlugin.php","line":525,"function":"createFile","class":"Sabre\\DAV\\Server","type":"->","args":["addressbooks\/users\/C9CT1\/contacts\/F4F699CC-9C88-4D37-AF88-BE0287667759.vcf","BEGIN:VCARD\r\nVERSION:4.0\r\nPRODID:-\/\/Nextcloud Contacts v3.1.5\r\nUID:e9a89eef-2d85-438a-ade1-300435578c0f\r\nREV;VALUE=DATE-AND-OR-TIME:20191126T163516Z\r\nFN:Erik Nelius\r\nADR;TYPE=HOME:;;;;;;\r\nEMAIL;TYPE=HOME:\r\nTEL;TYPE=\"HOME,VOICE\":\r\nEND:VCARD\r\n",null]},{"function":"httpPut","class":"Sabre\\DAV\\CorePlugin","type":"->","args":[{"absoluteUrl":"https:\/\/cloud.jonas-heinze.de\/nextcloud\/remote.php\/dav\/addressbooks\/users\/C9CT1\/contacts\/F4F699CC-9C88-4D37-AF88-BE0287667759.vcf","__class__":"Sabre\\HTTP\\Request"},{"__class__":"Sabre\\HTTP\\Response"}]},{"file":"\/var\/www\/cloud\/nextcloud\/3rdparty\/sabre\/event\/lib\/EventEmitterTrait.php","line":105,"function":"call_user_func_array","args":[[{"__class__":"Sabre\\DAV\\CorePlugin"},"httpPut"],[{"absoluteUrl":"https:\/\/cloud.jonas-heinze.de\/nextcloud\/remote.php\/dav\/addressbooks\/users\/C9CT1\/contacts\/F4F699CC-9C88-4D37-AF88-BE0287667759.vcf","__class__":"Sabre\\HTTP\\Request"},{"__class__":"Sabre\\HTTP\\Response"}]]},{"file":"\/var\/www\/cloud\/nextcloud\/3rdparty\/sabre\/dav\/lib\/DAV\/Server.php","line":479,"function":"emit","class":"Sabre\\Event\\EventEmitter","type":"->","args":["method:PUT",[{"absoluteUrl":"https:\/\/cloud.jonas-heinze.de\/nextcloud\/remote.php\/dav\/addressbooks\/users\/C9CT1\/contacts\/F4F699CC-9C88-4D37-AF88-BE0287667759.vcf","__class__":"Sabre\\HTTP\\Request"},{"__class__":"Sabre\\HTTP\\Response"}]]},{"file":"\/var\/www\/cloud\/nextcloud\/3rdparty\/sabre\/dav\/lib\/DAV\/Server.php","line":254,"function":"invokeMethod","class":"Sabre\\DAV\\Server","type":"->","args":[{"absoluteUrl":"https:\/\/cloud.jonas-heinze.de\/nextcloud\/remote.php\/dav\/addressbooks\/users\/C9CT1\/contacts\/F4F699CC-9C88-4D37-AF88-BE0287667759.vcf","__class__":"Sabre\\HTTP\\Request"},{"__class__":"Sabre\\HTTP\\Response"}]},{"file":"\/var\/www\/cloud\/nextcloud\/apps\/dav\/lib\/Server.php","line":316,"function":"exec","class":"Sabre\\DAV\\Server","type":"->","args":[]},{"file":"\/var\/www\/cloud\/nextcloud\/apps\/dav\/appinfo\/v2\/remote.php","line":35,"function":"exec","class":"OCA\\DAV\\Server","type":"->","args":[]},{"file":"\/var\/www\/cloud\/nextcloud\/remote.php","line":163,"args":["\/var\/www\/cloud\/nextcloud\/apps\/dav\/appinfo\/v2\/remote.php"],"function":"require_once"}],"File":"\/var\/www\/cloud\/nextcloud\/apps\/dav\/lib\/CardDAV\/CardDavBackend.php","Line":626,"CustomMessage":"--"},"userAgent":"Mozilla\/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit\/537.36 (KHTML, like Gecko) Chrome\/80.0.3965.0 Safari\/537.36 Edg\/80.0.334.3","version":"16.0.3.0"}
{"reqId":"wFTZFdiOt1rBiGetTt37","level":4,"time":"2019-11-26T16:35:31+00:00","remoteAddr":"90.186.241.108","user":"C9CT1","app":"webdav","method":"PUT","url":"\/nextcloud\/remote.php\/dav\/addressbooks\/users\/C9CT1\/contacts\/BDD777D9-D926-49D1-99DA-DD05FA443FF5.vcf","message":{"Exception":"Sabre\\DAV\\Exception\\BadRequest","Message":"VCard object with uid already exists in this addressbook collection.","Code":0,"Trace":[{"file":"\/var\/www\/cloud\/nextcloud\/3rdparty\/sabre\/dav\/lib\/CardDAV\/AddressBook.php","line":144,"function":"createCard","class":"OCA\\DAV\\CardDAV\\CardDavBackend","type":"->","args":["7","BDD777D9-D926-49D1-99DA-DD05FA443FF5.vcf","BEGIN:VCARD\r\nVERSION:4.0\r\nPRODID:-\/\/Nextcloud Contacts v3.1.5\r\nUID:04fbbfe4-f60a-40a3-977a-22e252a948d5\r\nREV;VALUE=DATE-AND-OR-TIME:20191126T163530Z\r\nFN:Felix Glaser\r\nADR;TYPE=HOME:;;;;;;\r\nEMAIL;TYPE=HOME:\r\nTEL;TYPE=\"HOME,VOICE\":\r\nEND:VCARD\r\n"]},{"file":"\/var\/www\/cloud\/nextcloud\/3rdparty\/sabre\/dav\/lib\/DAV\/Server.php","line":1096,"function":"createFile","class":"Sabre\\CardDAV\\AddressBook","type":"->","args":["BDD777D9-D926-49D1-99DA-DD05FA443FF5.vcf","BEGIN:VCARD\r\nVERSION:4.0\r\nPRODID:-\/\/Nextcloud Contacts v3.1.5\r\nUID:04fbbfe4-f60a-40a3-977a-22e252a948d5\r\nREV;VALUE=DATE-AND-OR-TIME:20191126T163530Z\r\nFN:Felix Glaser\r\nADR;TYPE=HOME:;;;;;;\r\nEMAIL;TYPE=HOME:\r\nTEL;TYPE=\"HOME,VOICE\":\r\nEND:VCARD\r\n"]},{"file":"\/var\/www\/cloud\/nextcloud\/3rdparty\/sabre\/dav\/lib\/DAV\/CorePlugin.php","line":525,"function":"createFile","class":"Sabre\\DAV\\Server","type":"->","args":["addressbooks\/users\/C9CT1\/contacts\/BDD777D9-D926-49D1-99DA-DD05FA443FF5.vcf","BEGIN:VCARD\r\nVERSION:4.0\r\nPRODID:-\/\/Nextcloud Contacts v3.1.5\r\nUID:04fbbfe4-f60a-40a3-977a-22e252a948d5\r\nREV;VALUE=DATE-AND-OR-TIME:20191126T163530Z\r\nFN:Felix Glaser\r\nADR;TYPE=HOME:;;;;;;\r\nEMAIL;TYPE=HOME:\r\nTEL;TYPE=\"HOME,VOICE\":\r\nEND:VCARD\r\n",null]},{"function":"httpPut","class":"Sabre\\DAV\\CorePlugin","type":"->","args":[{"absoluteUrl":"https:\/\/cloud.jonas-heinze.de\/nextcloud\/remote.php\/dav\/addressbooks\/users\/C9CT1\/contacts\/BDD777D9-D926-49D1-99DA-DD05FA443FF5.vcf","__class__":"Sabre\\HTTP\\Request"},{"__class__":"Sabre\\HTTP\\Response"}]},{"file":"\/var\/www\/cloud\/nextcloud\/3rdparty\/sabre\/event\/lib\/EventEmitterTrait.php","line":105,"function":"call_user_func_array","args":[[{"__class__":"Sabre\\DAV\\CorePlugin"},"httpPut"],[{"absoluteUrl":"https:\/\/cloud.jonas-heinze.de\/nextcloud\/remote.php\/dav\/addressbooks\/users\/C9CT1\/contacts\/BDD777D9-D926-49D1-99DA-DD05FA443FF5.vcf","__class__":"Sabre\\HTTP\\Request"},{"__class__":"Sabre\\HTTP\\Response"}]]},{"file":"\/var\/www\/cloud\/nextcloud\/3rdparty\/sabre\/dav\/lib\/DAV\/Server.php","line":479,"function":"emit","class":"Sabre\\Event\\EventEmitter","type":"->","args":["method:PUT",[{"absoluteUrl":"https:\/\/cloud.jonas-heinze.de\/nextcloud\/remote.php\/dav\/addressbooks\/users\/C9CT1\/contacts\/BDD777D9-D926-49D1-99DA-DD05FA443FF5.vcf","__class__":"Sabre\\HTTP\\Request"},{"__class__":"Sabre\\HTTP\\Response"}]]},{"file":"\/var\/www\/cloud\/nextcloud\/3rdparty\/sabre\/dav\/lib\/DAV\/Server.php","line":254,"function":"invokeMethod","class":"Sabre\\DAV\\Server","type":"->","args":[{"absoluteUrl":"https:\/\/cloud.jonas-heinze.de\/nextcloud\/remote.php\/dav\/addressbooks\/users\/C9CT1\/contacts\/BDD777D9-D926-49D1-99DA-DD05FA443FF5.vcf","__class__":"Sabre\\HTTP\\Request"},{"__class__":"Sabre\\HTTP\\Response"}]},{"file":"\/var\/www\/cloud\/nextcloud\/apps\/dav\/lib\/Server.php","line":316,"function":"exec","class":"Sabre\\DAV\\Server","type":"->","args":[]},{"file":"\/var\/www\/cloud\/nextcloud\/apps\/dav\/appinfo\/v2\/remote.php","line":35,"function":"exec","class":"OCA\\DAV\\Server","type":"->","args":[]},{"file":"\/var\/www\/cloud\/nextcloud\/remote.php","line":163,"args":["\/var\/www\/cloud\/nextcloud\/apps\/dav\/appinfo\/v2\/remote.php"],"function":"require_once"}],"File":"\/var\/www\/cloud\/nextcloud\/apps\/dav\/lib\/CardDAV\/CardDavBackend.php","Line":626,"CustomMessage":"--"},"userAgent":"Mozilla\/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit\/537.36 (KHTML, like Gecko) Chrome\/80.0.3965.0 Safari\/537.36 Edg\/80.0.334.3","version":"16.0.3.0"}
{"reqId":"gPlgJTMxdlY102t1ugOE","level":4,"time":"2019-11-26T16:37:37+00:00","remoteAddr":"90.186.241.108","user":"C9CT1","app":"webdav","method":"PUT","url":"\/nextcloud\/remote.php\/dav\/addressbooks\/users\/C9CT1\/contacts\/DC09EAA8-117D-4DA2-A251-63BA683DDD9B.vcf","message":{"Exception":"Sabre\\DAV\\Exception\\BadRequest","Message":"VCard object with uid already exists in this addressbook collection.","Code":0,"Trace":[{"file":"\/var\/www\/cloud\/nextcloud\/3rdparty\/sabre\/dav\/lib\/CardDAV\/AddressBook.php","line":144,"function":"createCard","class":"OCA\\DAV\\CardDAV\\CardDavBackend","type":"->","args":["7","DC09EAA8-117D-4DA2-A251-63BA683DDD9B.vcf","BEGIN:VCARD\r\nVERSION:4.0\r\nPRODID:-\/\/Nextcloud Contacts v3.1.5\r\nUID:f015c592-a522-4e02-bd79-11c31d9c2d75\r\nREV;VALUE=DATE-AND-OR-TIME:20191126T163731Z\r\nFN:Julian Rudolph\r\nADR;TYPE=HOME:;;;;;;\r\nEMAIL;TYPE=HOME:\r\nTEL;TYPE=\"HOME,VOICE\":\r\nEND:VCARD\r\n"]},{"file":"\/var\/www\/cloud\/nextcloud\/3rdparty\/sabre\/dav\/lib\/DAV\/Server.php","line":1096,"function":"createFile","class":"Sabre\\CardDAV\\AddressBook","type":"->","args":["DC09EAA8-117D-4DA2-A251-63BA683DDD9B.vcf","BEGIN:VCARD\r\nVERSION:4.0\r\nPRODID:-\/\/Nextcloud Contacts v3.1.5\r\nUID:f015c592-a522-4e02-bd79-11c31d9c2d75\r\nREV;VALUE=DATE-AND-OR-TIME:20191126T163731Z\r\nFN:Julian Rudolph\r\nADR;TYPE=HOME:;;;;;;\r\nEMAIL;TYPE=HOME:\r\nTEL;TYPE=\"HOME,VOICE\":\r\nEND:VCARD\r\n"]},{"file":"\/var\/www\/cloud\/nextcloud\/3rdparty\/sabre\/dav\/lib\/DAV\/CorePlugin.php","line":525,"function":"createFile","class":"Sabre\\DAV\\Server","type":"->","args":["addressbooks\/users\/C9CT1\/contacts\/DC09EAA8-117D-4DA2-A251-63BA683DDD9B.vcf","BEGIN:VCARD\r\nVERSION:4.0\r\nPRODID:-\/\/Nextcloud Contacts v3.1.5\r\nUID:f015c592-a522-4e02-bd79-11c31d9c2d75\r\nREV;VALUE=DATE-AND-OR-TIME:20191126T163731Z\r\nFN:Julian Rudolph\r\nADR;TYPE=HOME:;;;;;;\r\nEMAIL;TYPE=HOME:\r\nTEL;TYPE=\"HOME,VOICE\":\r\nEND:VCARD\r\n",null]},{"function":"httpPut","class":"Sabre\\DAV\\CorePlugin","type":"->","args":[{"absoluteUrl":"https:\/\/cloud.jonas-heinze.de\/nextcloud\/remote.php\/dav\/addressbooks\/users\/C9CT1\/contacts\/DC09EAA8-117D-4DA2-A251-63BA683DDD9B.vcf","__class__":"Sabre\\HTTP\\Request"},{"__class__":"Sabre\\HTTP\\Response"}]},{"file":"\/var\/www\/cloud\/nextcloud\/3rdparty\/sabre\/event\/lib\/EventEmitterTrait.php","line":105,"function":"call_user_func_array","args":[[{"__class__":"Sabre\\DAV\\CorePlugin"},"httpPut"],[{"absoluteUrl":"https:\/\/cloud.jonas-heinze.de\/nextcloud\/remote.php\/dav\/addressbooks\/users\/C9CT1\/contacts\/DC09EAA8-117D-4DA2-A251-63BA683DDD9B.vcf","__class__":"Sabre\\HTTP\\Request"},{"__class__":"Sabre\\HTTP\\Response"}]]},{"file":"\/var\/www\/cloud\/nextcloud\/3rdparty\/sabre\/dav\/lib\/DAV\/Server.php","line":479,"function":"emit","class":"Sabre\\Event\\EventEmitter","type":"->","args":["method:PUT",[{"absoluteUrl":"https:\/\/cloud.jonas-heinze.de\/nextcloud\/remote.php\/dav\/addressbooks\/users\/C9CT1\/contacts\/DC09EAA8-117D-4DA2-A251-63BA683DDD9B.vcf","__class__":"Sabre\\HTTP\\Request"},{"__class__":"Sabre\\HTTP\\Response"}]]},{"file":"\/var\/www\/cloud\/nextcloud\/3rdparty\/sabre\/dav\/lib\/DAV\/Server.php","line":254,"function":"invokeMethod","class":"Sabre\\DAV\\Server","type":"->","args":[{"absoluteUrl":"https:\/\/cloud.jonas-heinze.de\/nextcloud\/remote.php\/dav\/addressbooks\/users\/C9CT1\/contacts\/DC09EAA8-117D-4DA2-A251-63BA683DDD9B.vcf","__class__":"Sabre\\HTTP\\Request"},{"__class__":"Sabre\\HTTP\\Response"}]},{"file":"\/var\/www\/cloud\/nextcloud\/apps\/dav\/lib\/Server.php","line":316,"function":"exec","class":"Sabre\\DAV\\Server","type":"->","args":[]},{"file":"\/var\/www\/cloud\/nextcloud\/apps\/dav\/appinfo\/v2\/remote.php","line":35,"function":"exec","class":"OCA\\DAV\\Server","type":"->","args":[]},{"file":"\/var\/www\/cloud\/nextcloud\/remote.php","line":163,"args":["\/var\/www\/cloud\/nextcloud\/apps\/dav\/appinfo\/v2\/remote.php"],"function":"require_once"}],"File":"\/var\/www\/cloud\/nextcloud\/apps\/dav\/lib\/CardDAV\/CardDavBackend.php","Line":626,"CustomMessage":"--"},"userAgent":"Mozilla\/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit\/537.36 (KHTML, like Gecko) Chrome\/80.0.3965.0 Safari\/537.36 Edg\/80.0.334.3","version":"16.0.3.0"}
{"reqId":"Y1dpLlsH501pMG3l24O8","level":4,"time":"2019-11-26T16:38:05+00:00","remoteAddr":"90.186.241.108","user":"C9CT1","app":"webdav","method":"PUT","url":"\/nextcloud\/remote.php\/dav\/addressbooks\/users\/C9CT1\/contacts\/C145935F-BF84-4553-A816-9ECBAF152549.vcf","message":{"Exception":"Sabre\\DAV\\Exception\\BadRequest","Message":"VCard object with uid already exists in this addressbook collection.","Code":0,"Trace":[{"file":"\/var\/www\/cloud\/nextcloud\/3rdparty\/sabre\/dav\/lib\/CardDAV\/AddressBook.php","line":144,"function":"createCard","class":"OCA\\DAV\\CardDAV\\CardDavBackend","type":"->","args":["7","C145935F-BF84-4553-A816-9ECBAF152549.vcf","BEGIN:VCARD\r\nVERSION:4.0\r\nPRODID:-\/\/Nextcloud Contacts v3.1.5\r\nUID:ef826aa6-4cf3-4c17-bcef-be560f9f4c0e\r\nREV;VALUE=DATE-AND-OR-TIME:20191126T163804Z\r\nFN:Marijke Scholz\r\nADR;TYPE=HOME:;;;;;;\r\nEMAIL;TYPE=HOME:\r\nTEL;TYPE=\"HOME,VOICE\":\r\nEND:VCARD\r\n"]},{"file":"\/var\/www\/cloud\/nextcloud\/3rdparty\/sabre\/dav\/lib\/DAV\/Server.php","line":1096,"function":"createFile","class":"Sabre\\CardDAV\\AddressBook","type":"->","args":["C145935F-BF84-4553-A816-9ECBAF152549.vcf","BEGIN:VCARD\r\nVERSION:4.0\r\nPRODID:-\/\/Nextcloud Contacts v3.1.5\r\nUID:ef826aa6-4cf3-4c17-bcef-be560f9f4c0e\r\nREV;VALUE=DATE-AND-OR-TIME:20191126T163804Z\r\nFN:Marijke Scholz\r\nADR;TYPE=HOME:;;;;;;\r\nEMAIL;TYPE=HOME:\r\nTEL;TYPE=\"HOME,VOICE\":\r\nEND:VCARD\r\n"]},{"file":"\/var\/www\/cloud\/nextcloud\/3rdparty\/sabre\/dav\/lib\/DAV\/CorePlugin.php","line":525,"function":"createFile","class":"Sabre\\DAV\\Server","type":"->","args":["addressbooks\/users\/C9CT1\/contacts\/C145935F-BF84-4553-A816-9ECBAF152549.vcf","BEGIN:VCARD\r\nVERSION:4.0\r\nPRODID:-\/\/Nextcloud Contacts v3.1.5\r\nUID:ef826aa6-4cf3-4c17-bcef-be560f9f4c0e\r\nREV;VALUE=DATE-AND-OR-TIME:20191126T163804Z\r\nFN:Marijke Scholz\r\nADR;TYPE=HOME:;;;;;;\r\nEMAIL;TYPE=HOME:\r\nTEL;TYPE=\"HOME,VOICE\":\r\nEND:VCARD\r\n",null]},{"function":"httpPut","class":"Sabre\\DAV\\CorePlugin","type":"->","args":[{"absoluteUrl":"https:\/\/cloud.jonas-heinze.de\/nextcloud\/remote.php\/dav\/addressbooks\/users\/C9CT1\/contacts\/C145935F-BF84-4553-A816-9ECBAF152549.vcf","__class__":"Sabre\\HTTP\\Request"},{"__class__":"Sabre\\HTTP\\Response"}]},{"file":"\/var\/www\/cloud\/nextcloud\/3rdparty\/sabre\/event\/lib\/EventEmitterTrait.php","line":105,"function":"call_user_func_array","args":[[{"__class__":"Sabre\\DAV\\CorePlugin"},"httpPut"],[{"absoluteUrl":"https:\/\/cloud.jonas-heinze.de\/nextcloud\/remote.php\/dav\/addressbooks\/users\/C9CT1\/contacts\/C145935F-BF84-4553-A816-9ECBAF152549.vcf","__class__":"Sabre\\HTTP\\Request"},{"__class__":"Sabre\\HTTP\\Response"}]]},{"file":"\/var\/www\/cloud\/nextcloud\/3rdparty\/sabre\/dav\/lib\/DAV\/Server.php","line":479,"function":"emit","class":"Sabre\\Event\\EventEmitter","type":"->","args":["method:PUT",[{"absoluteUrl":"https:\/\/cloud.jonas-heinze.de\/nextcloud\/remote.php\/dav\/addressbooks\/users\/C9CT1\/contacts\/C145935F-BF84-4553-A816-9ECBAF152549.vcf","__class__":"Sabre\\HTTP\\Request"},{"__class__":"Sabre\\HTTP\\Response"}]]},{"file":"\/var\/www\/cloud\/nextcloud\/3rdparty\/sabre\/dav\/lib\/DAV\/Server.php","line":254,"function":"invokeMethod","class":"Sabre\\DAV\\Server","type":"->","args":[{"absoluteUrl":"https:\/\/cloud.jonas-heinze.de\/nextcloud\/remote.php\/dav\/addressbooks\/users\/C9CT1\/contacts\/C145935F-BF84-4553-A816-9ECBAF152549.vcf","__class__":"Sabre\\HTTP\\Request"},{"__class__":"Sabre\\HTTP\\Response"}]},{"file":"\/var\/www\/cloud\/nextcloud\/apps\/dav\/lib\/Server.php","line":316,"function":"exec","class":"Sabre\\DAV\\Server","type":"->","args":[]},{"file":"\/var\/www\/cloud\/nextcloud\/apps\/dav\/appinfo\/v2\/remote.php","line":35,"function":"exec","class":"OCA\\DAV\\Server","type":"->","args":[]},{"file":"\/var\/www\/cloud\/nextcloud\/remote.php","line":163,"args":["\/var\/www\/cloud\/nextcloud\/apps\/dav\/appinfo\/v2\/remote.php"],"function":"require_once"}],"File":"\/var\/www\/cloud\/nextcloud\/apps\/dav\/lib\/CardDAV\/CardDavBackend.php","Line":626,"CustomMessage":"--"},"userAgent":"Mozilla\/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit\/537.36 (KHTML, like Gecko) Chrome\/80.0.3965.0 Safari\/537.36 Edg\/80.0.334.3","version":"16.0.3.0"}
{"reqId":"yUltjXgJQSSp9Ik69kxh","level":3,"time":"2019-11-26T16:43:33+00:00","remoteAddr":"90.186.241.108","user":"Admin","app":"jsresourceloader","method":"GET","url":"\/nextcloud\/index.php\/apps\/announcementcenter\/","message":"Could not find resource js\/oc-backbone-webdav.js to load","userAgent":"Mozilla\/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit\/537.36 (KHTML, like Gecko) Chrome\/80.0.3965.0 Safari\/537.36 Edg\/80.0.334.3","version":"16.0.3.0"}
{"reqId":"yUltjXgJQSSp9Ik69kxh","level":3,"time":"2019-11-26T16:43:33+00:00","remoteAddr":"90.186.241.108","user":"Admin","app":"jsresourceloader","method":"GET","url":"\/nextcloud\/index.php\/apps\/announcementcenter\/","message":"Could not find resource vendor\/select2\/select2.js to load","userAgent":"Mozilla\/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit\/537.36 (KHTML, like Gecko) Chrome\/80.0.3965.0 Safari\/537.36 Edg\/80.0.334.3","version":"16.0.3.0"}
{"reqId":"yUltjXgJQSSp9Ik69kxh","level":3,"time":"2019-11-26T16:43:33+00:00","remoteAddr":"90.186.241.108","user":"Admin","app":"cssresourceloader","method":"GET","url":"\/nextcloud\/index.php\/apps\/announcementcenter\/","message":"Could not find resource vendor\/select2\/select2.css to load","userAgent":"Mozilla\/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit\/537.36 (KHTML, like Gecko) Chrome\/80.0.3965.0 Safari\/537.36 Edg\/80.0.334.3","version":"16.0.3.0"}
{"reqId":"EXcDVx3gnvQyfPwoOL3N","level":3,"time":"2019-11-26T20:16:33+00:00","remoteAddr":"90.186.241.108","user":"C9CT1","app":"jsresourceloader","method":"GET","url":"\/nextcloud\/index.php\/apps\/announcementcenter\/","message":"Could not find resource js\/oc-backbone-webdav.js to load","userAgent":"Mozilla\/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit\/537.36 (KHTML, like Gecko) Chrome\/70.0.3538.102 Safari\/537.36 Edge\/18.18362","version":"16.0.3.0"}
{"reqId":"4ntfqVjx4UswBin2jPmC","level":3,"time":"2019-11-28T09:34:09+00:00","remoteAddr":"185.155.191.204","user":"Admin","app":"PHP","method":"POST","url":"\/nextcloud\/index.php\/login\/v2\/grant","message":"Undefined index: urlGenerator at \/var\/www\/cloud\/nextcloud\/core\/templates\/loginflowv2\/done.php#29","userAgent":"Mozilla\/5.0 (X11; Ubuntu; Linux x86_64; rv:66.0) Gecko\/20100101 Firefox\/66.0","version":"16.0.3.0"}

Hi, I can’t use my Nextcloud using Firefox or Chromium (MS Edge and Edge Dev works fine).
I can’t see files in the all files area and some buttons are missing/faulty.

The next picture is how it should like (Edge Dev):

The next pictures are showing how it looks like (Firefox):


Thanks for your help. ^-^

Have a nice day
MrWaffelXD

Are you using ublock origin or some other adblocker? there is a few issues with the filtering and nextcloud

Hey @dugite-code,
thanks for your reply.
Unfortunately I tried using a normal Firefox installation without any adblockers etc. In my case it wouldn’t work.