Videos don't play on LG G2.
I'm running Firefox 28.0.1 on my Verizon LG G2 with Jelly Bean, 4.2.2. For some reason video doesn't play. Any video. It can be vimeo, flash, YouTube... The sound plays, but the spinning ball of doom is the only image. It doesn't seem to be an outright fail since there IS sounds, but why not video? I'm not finding and solution or replicated error online.
Opaite Mbohovái (5)
Google Stopped supporting Adobe flash, So you need to install it manually.
How do I manually install Flash Player on my Android device?
It isn't a flash issue. Video works fine on Chrome. It's any video whatsoever, not just flash. If it was flash, the sound wouldn't work either... the sound comes out, but the images do not play.
Any particular website or all website
Yes, this is the case for all websites, regardless of format for the video (HTML5, flash, embedded, YouTube, Vimeo, whatever is used on Wimp, whatever is used on Facebook).
Could you try with Firefox Beta