Blocked loading mixed active content, Mozilla only

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The Basics

Nextcloud Hub 26 Spring (34.0.3)

Operating system Debian 13

Web server and version Apache/2.4.67 (Debian)

Reverse proxy Version: 1.26.3-3+deb13u1

PHP version 8.4.23

Installation method (LXC)

Are you using CloudfIare, mod_security, or similar? ( No)

Web Browser: Mozzila firefox 154.0 (64-bit)

I use Collabora online for office documents. Everything works fine, but in Mozilla Firefox I have a problem with mixed content (http).
Besides, nextcloud doesn’t want to connect to the Collabora server, so of course it won’t open the office document.
I use a reverse proxy and SSL is terminated there. The connection between the Collabora server and nextcloud is unencrypted.

Interestingly, it works fine in Google Chrome and Chromium

blocked
blocked3321Ă—893 418 KB

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Hello @gusto,
welcome to the Nextcloud community :handshake:

You’ve posted a request in the support section. Unfortunately you have not completed the required support template. Please edit your post and add as much information as possible so that community supporters have the necessary technical information to help you resolve your issue!

Without additional information the community members cannot help you.

Regards,
jtr