Firefox wont play certain media (some gifs, mp4s, webm)

[bucfan11]

Ive gone through some basic checks, completely removed Firefox and the profile folders, reinstalled. No luck. These files play on other browsers like Chrome.
I am running latest version of Windows 10 x64.

For example, neither of these play:
http://video.webmfiles.org/big-buck-bunny_trailer.webm
http://www.w3schools.com/html/html5_video.asp

I dont know what else to check at this point.

[DanRaisch]

Does the same thing occur if you launch the application in Mozilla Safe Mode? http://kb.mozillazine.org/Safe_mode

[bucfan11]

Does the same thing occur if you launch the application in Mozilla Safe Mode? http://kb.mozillazine.org/Safe_mode

Yes. Same thing

[bucfan11]

Could I compare any specific firefox files to files on a laptop that has the same version of Firefox that doesnt have an issue playing these videos files?

[DanRaisch]

What you probably should be comparing is the contents of the plug-ins lists. Use menu path Tools->Addons->Plug0ins and see if the same items appear on both computers.

[bucfan11]

What you probably should be comparing is the contents of the plug-ins lists. Use menu path Tools->Addons->Plug0ins and see if the same items appear on both computers.

Only major differences I see are related to graphics card and things installed like Adobe. I dont see anything really related to codecs or video that would expose that the deal is.

The laptop can play gfycat site gifs with no issue. The desktop does not. I see this when viewing the webconsole:

All candidate resources failed to load. Media load paused. gfycat.com
<source> element has no “src” attribute. Media resource load failed.

[dfoulkes]

On Win7 here and all vids that you mentioned play fine on this laptop.

What OS do you use on your laptop? ... also, what AV software do you use on both system?

[paradis_pal]

I tested the links they works, not once I had a trouble playing media in both PC, linux, even in android, except sometimes in android it will not open some sites

Though according to https://html5test.com/ it misses MPEG-4 ASP support and H.265 support and in streaminf Dynamic Adaptive Streaming / MPEG-DASH and HTTP Live Streaming / HLS

but almost all the browsers miss these coded

[bucfan11]

I said hell with it and reinstalled Windows 10. All is fine now. Ill just have to keep mindful of what I install going forward and check the vids after anything major. Wouldve been nice to figure out just what happened. Thanks again for the help

[James]

A easy way to see if your system can fully support HTML5 video is a www.youtube.com/html5

All check marks should be blue. On Windows one reason to get red checks is if you do not have appropriate media packs installed due to using N or KN versions of Windows Vista or newer as mentioned in https://support.mozilla.org/en-US/kb/fi ... ox-windows