1. about:config > I'll be careful, I promise!
2. Search: media.windows-media-foundation.enabled
3. Change value to false
4. Refresh Vine and voilà

media.windows-media-foundation.enabled is for Vista and later. The OP is using Windows XP, so needs to look at media.directshow.enabled

See also this thread:

• [/questions/1053509]

Jordan Delgado said

1. about:config > I'll be careful, I promise!
2. Search: media.windows-media-foundation.enabled
3. Change value to false
4. Refresh Vine and voilà

I tried it, but nothing happened.

cor-el said

media.windows-media-foundation.enabled is for Vista and later. The OP is using Windows XP, so needs to look at media.directshow.enabled See also this thread:

• [/questions/1053509]

What should be the value there?

If you want to disable the HTML5 media player and make the website possibly fallback to Flash then you need to set the pref to false.

• media.directshow.enabled = false

Note that this will prevent Firefox from using the HTML5 media player to play MP3 files.

It doesn't work either.

I tried Google Chrome and it worked just fine. :/ Well, it's not important, really, I don't use it very much, but... And I've seen it's a common problem amongst Firefox users...

Thank you for your anwers, anyway :)