Certain videos (HTML5?) not loading on Firefox

[gorillion]

I've recently encountered a problem with Firefox, where certain videos, such as those in the embedded tumblr video player, and vines refuse to load or play on Firefox, I tested them with chrome,and they work there. I updated Flash, restarted my comp; but nothing seems to work. Help?

[RobertJ]

.
Example URL?

.

[gorillion]

.
Example URL?

.

if you mean a page where the video won't load, here's a vine...
https://vine.co/v/OpTxd3vagzJ

[RobertJ]

.
That video works for me using FF35.

Note that you must accept cookies from the site and allow JavaScript.

.

[JayhawksRock]

Works on WinXP for me, but only with Flash Plugin enabled (not ask) and OpenH264 disabled...

[TheVisitor]

WFM, and seems to be playing HTML5 here...

[gorillion]

.
That video works for me using FF35.

Note that you must accept cookies from the site and allow JavaScript.

.

this shows up on my plugins page,
> http://i.gyazo.com/74b47e458f86179218ce9185e8679fbf.png
and it doesn't give me an option to enable it?

[TheVisitor]

.
That video works for me using FF35.

Note that you must accept cookies from the site and allow JavaScript.

*snip image*
and it doesn't give me an option to enable it?

Java is NOT Javascript.

Check about:config (enter in address bar)
Look for pref: javascript.enabled
Make sure its set to True

[gorillion]

.
That video works for me using FF35.

Note that you must accept cookies from the site and allow JavaScript.

*snip image*
and it doesn't give me an option to enable it?

Java is NOT Javascript.

Check about:config (enter in address bar)
Look for pref: javascript.enabled
Make sure its set to True

it was already enabled, so this doesnt seem to go anywhere...

[RobertJ]

.
Are you allowing cookies from the site?

.

[mightyglydd]

WFM, and seems to be playing HTML5 here...

+1

[RobertJ]

.
Also HTML5 for me.

.

[gorillion]

.
Are you allowing cookies from the site?

.

i have cookies enabled, and my exceptions are empty, so it would be safe to assume "yes"

[RobertJ]

See what happens in FF safe-mode.

On the menu bar, click the Help menu and select Restart with Add-ons Disabled.... Firefox will start up with the Firefox Safe Mode dialog. Click continue in Safe Mode and don't check any items.

FYI - What safe-mode does and doesn't do

• The status of plug-ins is not affected.
• Custom preferences are not affected.
• All extensions are disabled.
• The default theme is used, without a persona.
• userChrome.css and userContent.css are ignored.
• The default toolbar layout is used.
• Hardware acceleration is disabled.
• JIT JavaScript compiler is disabled.

.

[gorillion]

i just put it in safe mode, and the problem persists.