web-bugs VS HTML5test

The thread is very long, here is the relevant comment:

https://github.com/webcompat/web-bugs/issues/131916#issuecom...

https://github.com/webcompat/web-bugs/issues?q=is%3Aopen+is%...

Microsoft Teams (which I don't think many people use voluntarily) in particular breaks in stupid ways - and then in others if you spoof your user agent.

a link to the video would help with troubleshooting, seems like another case of "this site or this particular feature doesn't support firefox" otherwise report to https://webcompat.com/

Have any of you faced this? If the website is made to open only in chromium-based browsers, I am planning to report to Webcompat. But before that, I thought I would make sure from others. Any experience or quick fix would be appreciated.

Teams was a classic hellhole for me when I was using Linux. Nowadays it lets you in but Firefox genuinely doesn't support all of the features the Teams site uses. This means certain features are made unavailable to Firefox users. Forcing the user agent makes some of these partially work but they are also still broken so Mozilla doesn't want to enable a user agent override by default and Microsoft doesn't want to enable a feature that only half works.

This GitHub WebCompat issue serves as a good example history https://github.com/webcompat/web-bugs/issues/77892

https://github.com/webcompat/web-bugs/issues/125920#issuecom...

having recently looked at a firefox performance regression for filing a bugreport, tooling that tracks performance (quite publicly) sees attention, easy upload to share tracing profiles also helps: https://firefox-source-docs.mozilla.org/testing/perfdocs/ind...

Their dedicated blog keeps you posted if firefox perf is your interest https://blog.mozilla.org/performance/

If you have a particular website you notice chromium being significantly faster with, for an easy report, there's https://webcompat.com/ - though bugzilla is better than it seems when coming from github issues

I just don't know what else I can do. I compared Chromium and Firefox in html5test.com, got same result. All browsers says they doesn't support H.265. I turned off HW acceleration, nothing changes. I installed ffmpeg-libs and other codecs from Fedora wiki. Nothing changes. Videos are same vp9 in browsers. I spent all day googling but nothing helpful.

What does https://html5test.com/ say for h.264, VP8, VP9 and Theora support? What does it say for aac, Opus, Vorbis and mp3 support?

You can use this website also https://html5test.com is really helpful with more datails

If I go on html5test.com, no matter which browser I use, H265 support is not enabled and I couldn't find any article online that explains why -- what am I missing here?

When I install Opera via flatpak and do html 5 test it says h264 is not supported, what can I do?

What does https://html5test.com/ say for h.264 and aac support?

The h264 test page shows the same output in both chromium and chrome, and i can play the same formats from this page