Could you try disabling graphics hardware acceleration? Since this feature was added to Firefox, it has gradually improved, but there still are a few glitches.

You might need to restart Firefox in order for this to take effect, so save all work first (e.g., mail you are composing, online documents you're editing, etc.).

orange Firefox button or classic Tools menu > Options > Advanced

On the "General" mini-tab, uncheck the box for "Use hardware acceleration when available"

You can also try to "disable the hardware acceleration" in the Flash Player.

• http://helpx.adobe.com/flash-player/kb/video-playback-issues.html

See also:

• https://support.mozilla.org/kb/Cannot+view+full+screen+Flash+videos

Flash "Display settings" window:

• http://www.macromedia.com/support/documentation/en/flashplayer/help/help01.html

I'll try turning off the hardware acceleration, but is there anything I'm missing out on by disabling it?

Doesn't seem to fix the issue, the videos work fine, it's only when it's paused or not playing.

I'll try turning off the hardware acceleration, but is there anything I'm missing out on by disabling it?

I think the only difference is that the processing would have to all be done by the CPU rather than being split between the CPU and GPU.

Did you try disabling both Firefox's and Adobe's acceleration?

Did both and to no avail, not sure if I should just wait until the next flash update since this only started when I updated it.

I've fixed the problem by installing the older version of Flash Player (v11.2.202.235).

- First, download the uninstaller from here.

- Close your browser(s).

- Run uninstaller and remove flash player.

- After the uninstall process, download and install the old version from here.

Note: Download "Adobe Flash Player 11.2.202.235 (Non-IE)" if you are using 32 bit OS

Or

Download "Adobe Flash Player 11.2.202.235 (x64) (Non-IE)" for 64 bit OS.