Okay this just happened like 10 minutes ago. While i was exploring the internet my cat jumped up my bed. Then he pressed my keyboard keys, as soon as that happened The screen takes the whole screen, now i can only seen the start button when i minimize the page i am on. Also the tools and everything that you usually see at the top of firefox(tools, home, edit, ect) aren't there. I guess my cat pressed something to make the screen larger and i don't know how to fix this. If you need a picture of my problem just post.
Hey. Gotta love cats. Anywho, have you checked your screen resolution? Or could be some special keyboard shortcut that's special for your computer, especially if it's a laptop. It'd be awesome to see a pic.