mine are opening too large, I can see all the game contollers..it has zoomed in and cut off a lot of the game

Reset the page zoom on pages that cause problems: View > Zoom > Reset (Ctrl+0 (zero); Cmd+0 on Mac) The shortcut key won't work if the Flash plugin has focus.

See Font size and zoom - increase the size of web pages and Font size and zoom - increase the size of web pages and http://kb.mozillazine.org/Zoom_text_of_web_pages

The screen for my facebook games is small. Adjusting the Zoom does NOT fix it. My game is in a box about 4 inches square and there is a 3 inch black space next to it (Like it's trying to load - usually the game takes up this entire space). Everything else is the normal size. Is this some kind of Firefox glitch? Can it be fixed? It's really annoying...Thanks

My screen for the games on Facebook is super small also. This just started for me yesterday. The screen is so small that I am unable to see all of the aspects of each game and can't play them correctly. It's about half the size it should be. I'm not very happy with it either, because it just means that I will have to use chrome instead of firefox, which I prefer, to use Facebook now. If there isn't going to be a quick fix for this, I will just have to delete firefox and go back to using chrome.

You can also check the right-click context menu menu of the Flash object to see if you can zoom out the Flash object.