How can I make webpages fit my browser?

-I didn't change anything (no screen resolution or zooming in) and now facebook and some other webpages (not all) seem to be too wide for my screen. I have to scroll the bar sideways!



Where does the problem come from and how can I solve it?



Again, I didn't zoom in and I didn't change the screen resolution. I'm using Firefox 5.0 on Windows Vista. Screen res. 1366x768 (it has always been like that, didn't touch anything).



Thanks! :)just do CTRL plus + (hold ctrl as you hold +)
hit CTRL and 0 at the same time.

Or go to View->Zoom->Reset