Firefox will not display videos since Yosemite migration

Good day!
I run an early 2011 15" MacBook Pro, 2,2 GHz Intel Core i7 with 4g 1333 MHz DDR3 Memory, and an Intel HD Graphics 3000 with 384 Mo. Firefox is 34.0.5.
Since I migrated to Yosemite (10.10.1), the browser I use (Firefox) will not display the videos, but plays the sound out of them...
I tried to clear the PRAM (NVRAM) with the Command (⌘), Option, P, and R, but it doesn't work. I even tried to shut down the graphic acceleration option in Firefox, to no avail...
What else should I do? Any solution out there?
Thanks, and Merry Christmas to you all!
Martin

    System Preferences > Flash Player > Advanced > Delete All
     Press the "Delete All" button.
     Install Adobe Flash Player.
    http://get.adobe.com/flashplayer/
   Download it first.
   The next step is important.
   Click Safari in the menubar and select “Quit Firefox.
    Follow the prompts and install it.
    Restart computer.

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