Firefox सहायक फोरम

Hello

I want to open pdfs from firefox (snap 101.0.1) with the default application of the system (Xubuntu 22.04) and not open them in a new tab within forefox.

But it does not work, as if there was a problem with the system handler but only for pdfs and not for other file formats.

More details :

• I changed Preferences/general/Applications for pdfs to use either "always ask" (and then chose "open" " With system handler" when asked) or "default system application". In both cases the pdf is downloaded but not opened. If I right click on the downloaded pdf in the list of downloaded files and then chose "open with system handler", nothing happens.
• Opening the pdf inside Firefox works well and opening pdfs saved on my disk (outside firefox) as well.
• Opening other file format by choosing to open them from firefox with the system handler works well too (tested eg with .torrent, .xls, .tif,...).
• I tried to change the default system application for pdf (Atril) to other softwares without success (Okular, Evince).
• If I try to open a .djvu file with the "system handler" it is opened correctly using Atril which is the also default for pdfs... So Atril works for .djvu files but not for pdfs...
• I tried to replace the handlers.json file from my profile by a handler.json file from a brand new profile, without success (I still have a backup of my old profile file if needed). I did that because opening with the system application worked before and the bug appeared after I changed all applications preferences to "always ask" (and there were a lot of them in my rather old handlers.json file).

I'm lost...

After I have started the computer and have opened the Firefox Developer Edition, there is no website content visible - everything is transparent. Links are clickable and context menu opens up, but the content is just transparent (screenshot attached).

When I close & repone the firefox, then usually on 5th to 10th attempt everything starts working until next reboot.

Firefox(Default edition v94.0) is working just fine with no problems on same machine.

When I first noticed this, version was 95.0b3. Now I'm on 95.0b12.

OS is Xubuntu 21.10 and hardware is HP ZBook Power G8 - i5-11400H, Nvida Quadro T600.

I've already tried: 1) opening on safe mode, 2) reinstalling using Ubuntu's "umake" commant line tool, 3) reinstalled by downloading it from https://download.mozilla.org/?product=firefox-devedition-latest-ssl&os=linux64&lang=en-US and copying the files, 4) opening computer using both Nvida's and Intel's built-in gpu

but nothing have worked so far - still the issue persists.

Is there anything else I should try?

Thanks!

I have Firefox installed on an XUbuntu 20.04.2 LTS machine. preferences to "restore previous session" on startup. Intermittently, when I launch the browser, one of my windows has a very strange appearance (please note the general look of the window in the attached screenshot and ignore the "page cannot be displayed" message, as the screenshot was taken when I was not connected to the Internet.)

I have already tried reseting Firefox and that does not make the problem go away permanently; it always comes back eventually. (Note: I cleared cache before, and cookies after, taking the screenshot but before opening this support request. So the "troubleshooting information" attached reflects how it is after cookies are cleared.)