Looks like you have an add-on that could be blocking something. Did you try the same steps with Firefox in Safe Mode? https://support.mozilla.org/en-US/kb/diagnose-firefox-issues-using-troubleshoot-mode#w_how-to-start-firefox-in-4troubleshoot-modesf5safe-modesf

Let me try the same step in openSUSE and see what happens.

Looks like you have an add-on that could be blocking something. Did you try the same steps with Firefox in Safe Mode?

Yep, still not working.

Also try downloading Firefox from Mozilla, run firefox-bin from the folder and see if you have the same issue. https://www.mozilla.org/en-US/firefox/all/#product-desktop-release

I got the https warning, but it works for me. see screenshots https://www.thinkbroadband.com/download

Operating System: openSUSE Tumbleweed 20220908 KDE Plasma Version: 5.25.5 KDE Frameworks Version: 5.97.0 Qt Version: 5.15.5 Kernel Version: 5.19.7-1-default (64-bit) Graphics Platform: X11 Processors: 8 × Intel® Xeon® CPU E3-1535M v5 @ 2.90GHz Memory: 62.7 GiB of RAM Graphics Processor: Mesa Intel® HD Graphics P530 Product Name: HP ZBook 17 G3

Also for email attachment that is something you need to contact your email support that your using to help with that command.

No mention of email attachments so why this comment?

Also try downloading Firefox from Mozilla, run firefox-bin from the folder and see if you have the same issue. https://www.mozilla.org/en-US/firefox/all/#product-desktop-release

Update?

I run Firefox from firefox-bin and it worked; I then reinstalled it manually from the tar.bz2 archive.