I have a copy of the old YouTube HTML5 support page you can use as the first-level test of where video support is falling short:

https://www.jeffersonscher.com/sumo/html5-video.html

The expected result is: supported, probably, probably, supported, supported, supported

If yours doesn't match, which ones are a problem?

I have a copy of the old YouTube HTML5 support page you can use as the first-level test of where video support is falling short: https://www.jeffersonscher.com/sumo/html5-video.html The expected result is: supported, probably, probably, supported, supported, supported If yours doesn't match, which ones are a problem?

spp / sss I am not sure what to do with this information.

I also got errors when updating this reply. This stuff has only started happening recently and only noticed after a bunch of pc updates, am wondering if Firefox is being crushed by competition.

When i closed this browser today the Desktop shortcut and my Taskbar icon were deleted aswell, something really fishy is going on with this browser.

That sounds a bit suspicious. In case Firefox's program files became corrupted, could you re-run the full installer? It should do an in-place update (no need to uninstall first):

https://www.mozilla.org/firefox/all/desktop-release/

Any more information available in the Web Console?

• https://firefox-source-docs.mozilla.org/devtools-user/web_console/

That sounds a bit suspicious. In case Firefox's program files became corrupted, could you re-run the full installer? It should do an in-place update (no need to uninstall first): https://www.mozilla.org/firefox/all/desktop-release/

I will give that a go and see if things improve. Again it has only happened recently since a bunch of windows updates. I have not had to update Firefox during this stuff, but if i open google chrome it's always got new updates.

My original issue of why im here still remains. And looking through other posts i see other people are getting similar issues with format issues and MIME.

Any more information available in the Web Console?

• https://firefox-source-docs.mozilla.org/devtools-user/web_console/

Mostly just this stuff. (screenshots)

I'll assume by the amount of other threads with similar problems.. that this is a forever issue with Firefox and windows and google are working to cause issues so they can get all their ad money without competition.