Nextcloud Talk (crashes)

Nextcloud version (13.0.0 RC4):
Operating system and version (Ubuntu 16.04 LTS updated):
Apache or nginx version (Apache 2.4.18-2ubuntu3.5 uptodate):
PHP version (7.0):

The issue you are facing:

Is this the first time you’ve seen this error? (Y):

Steps to replicate it:

  1. Open Nextcloud Talk app / with default settings - all with Firefox Latest Build
  2. Enable Webcam session with 2nd User
  3. Enable Screen? Sharing (btw why only 1 Application is possbile and not the full screen)
  4. Resize or close the Shared Application
  5. Screensharing Host Firefox Crashes

The output of your Nextcloud log in Admin > Logging:

Nothing

The output of your config.php file in /path/to/nextcloud (make sure you remove any identifiable information!):

<?php
$CONFIG = array (
  'instanceid' => '*',
  'passwordsalt' => '*',
  'secret' => '*',
  'trusted_domains' =>
  array (
    0 => '*',
    1 => '*',
  ),
  'datadirectory' => '/data',
  'dbtype' => 'mysql',
  'version' => '13.0.0.13',
  'dbname' => 'nextcloud',
  'dbhost' => 'localhost',
  'dbport' => '',
  'dbtableprefix' => 'oc_',
  'dbuser' => '*',
  'dbpassword' => '*',
  'logtimezone' => 'UTC',
  'installed' => true,
  'maintenance' => false,
  'theme' => '',
  'loglevel' => '0',
  'filelocking.enabled' => true,
  'memcache.locking' => '\\OC\\Memcache\\Redis',
  'memcache.local' => '\\OC\\Memcache\\APCu',
  'memcache.distributed' => '\\OC\\Memcache\\Memcached',
  'mail_from_address' => '*',
  'mail_smtpmode' => 'php',
  'mail_smtpauthtype' => 'LOGIN',
  'mail_domain' => '*',
  'mail_smtphost' => '*',
  'mail_smtpport' => '25',
  'ldapIgnoreNamingRules' => false,
  'ldapProviderFactory' => '\\OCA\\User_LDAP\\LDAPProviderFactory',
  'trusted_proxies' =>
  array (
    0 => '*',
  ),
  'overwriteprotocol' => 'https',
  'overwritecondaddr' => '*',
  'overwrite.cli.url' => '*',
  'updater.release.channel' => 'beta',
);

The output of your Apache/nginx/system log in /var/log/____:

No Errors

This might be an issue with Firefox and WebRTC then. From my understanding Nextcloud only helps the user to establish the connection via WebRTC and then it is an end to end connection between the browsers.