I'm only getting one quarter of a screen on Flash Player on Firefox.

Only the upper left quadrant of the Flash Player screen has content. The rest of the screen is either blank or the original static image. This occurs on YouTube and any website that has Flash Player content. Computer is a Macbook Pro Retina using OSX 10.8.4. I've uninstalled and reinstalled Flash Player (twice) and uninstalled and reinstalled Firefox. The problem doesn't occur when I'm using Safari.

The below bug wasn't the relevant one. The correct bug is: [https://bugzilla.mozilla.org/show_bug.cgi?id=903296 903296 – With hardware acceleration off, Flash displayed only in the top left quarter on Mac OSX].
'''''Earlier Post:'''''
This has been submitted to the bug tracking system this morning: [https://bugzilla.mozilla.org/show_bug.cgi?id=907792 907792 – Embedded YouTube videos only display 1/4 of the video on Retina MBP/OSX].
A note regarding the bug tracking system: If forum members can contribute to the development, please feel free to pitch in. Otherwise, it's generally not helpful to add comments to bugs (unless there is a call for test cases), but you can register on the Bugzilla site and "vote" for them to be fixed. See:
* [https://bugzilla.mozilla.org/page.cgi?id=etiquette.html Bugzilla Etiquette]
* [https://bugzilla.mozilla.org/page.cgi?id=voting.html Voting]
The first comment in the bug reports:
<blockquote>If I disable HiDPI support by setting the gfx.hidpi.enabled pref to -1, then the embedded videos are displayed correctly.</blockquote>
If you want to try this, the steps are:
(1) In a new tab, type or paste '''about:config''' in the address bar and press Enter. Click the button promising to be careful.
(2) In the filter box, type or paste '''gfx''' and pause while the list is filtered
(3) Double-click '''gfx.hidpi.enabled''' and edit the value from 1 to 0 or lower (e.g., -1). I don't know whether this works immediately or you need to exit and restart Firefox in order to see the effect.
According to a comment in the source code, these are the possible values for that preference (must be a whole number with no decimal):
// gfx.hidpi.enabled is an integer with the meaning:
// <= 0 : HiDPI support is disabled
// 1 : HiDPI enabled provided all screens have the same backing resolution
// > 1 : HiDPI enabled even if there are a mixture of screen modes

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