I’m having this REALLY weird issue where flash content (Youtube, blog badges, etc) doesn’t display except when it is near the top/bottom of the Firefox window.
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This has been happening to me since I switched to the Mac. It is annoying beyond words, but it doesn’t happen on every site using Flash, and until today it wasn’t an issue on my web site (the player for Utterz audio posts is flash). My own web site not displaying 100% accurately on my own computer is utterly unacceptable. I decided I had to solve the problem and stop just putting up with it. The solution is so easy, and so far I haven’t noticed any negative consequences.

Go to about:config, set extensions.adblockplus.frameobjects to false.

Now if I could find some way to set a default post title in Wordpress, I would be a totally happy camper. The search for an easy solution to that problem is ongoing.