Mac Users: How can I watch YouTube again on Firefox, when for months all I get is a black screen and no controls?

Beyond frustrated here. I can watch YouTube on Safari (I have a MacBook Pro laptop, OS 10.6.8), but I use Firefox, for everything else, so really need YouTube access on Firefox. I have googled the problem a zillion times and find solutions that do not work.
Today in several places, including here at Firefox, the instruction is to uncheck the "Enable Hardware Acceleration" box which is found when you right-click (two-finger click on my trackpad) on the black YouTube screen. Then click on Settings, which brings up a display box. In the display box I'm supposed to be able to uncheck the hardware acceleration. And I see it there in front of me.
But it's dead to my trackpad! The Enable Hardware Acceleration will not uncheck when I click on its tiny box. It's supposed to be active, but nothing I do in that display box works--even the close button. I've refreshed the page, tried clicking the icons on it, nothing works.
Can you imagine no YouTube for months? It's driving me crazy. PLEASE help, I will be so grateful!
Thanks~~

Start Firefox in <u>[[Safe Mode]]</u> to check if one of the extensions or if hardware acceleration is causing the problem (switch to the DEFAULT theme: Firefox (Tools) > Add-ons > Appearance/Themes).
*Don't make any changes on the Safe mode start window.
*https://support.mozilla.com/kb/Safe+Mode
Try to disable the hardware acceleration in the Flash Player.
See:
* https://support.mozilla.com/kb/Cannot+view+full+screen+Flash+videos
* http://www.youtube.com/swf_test.html (right-click the player: Settings)
Flash "Display settings" window:
* http://www.macromedia.com/support/documentation/en/flashplayer/help/help01.html

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