Vines will not play, not on the main website (vine.co) nor on Tumblr. I'm not having issues with any other videos or websites; it's just vines. I'm not even that into vines, but occasionally I want to watch one and it's incredibly frustrating that it just. Doesn't. Work. Things I have tried that had no effect: + Updating Flash, Java, etc. + Starting FF in safemode to see if any of my (very few) extensions were causing problems. + "Refreshing" FF. + media.windows-media-foundation.enabled was set to "true" when I went to about:config. Changing it to "false" did absolutely nothing, and changing it back to "true" also did nothing. + Whitelisting vine.co in Adblock. It's just incredible that none of the suggested fixes have had the slightest effect, and also that it doesn't work in the first place. Considering just dumping FF and going back to Chrome, despite the annoyance that would cause. I'm just very frustrated with this stupid problem that apparently can't be fixed on my computer. Maybe someone will have a working suggestion. Thanks in advance.