Why does firefox do this?

[ikermalli]

Hey everyone,

So I am running Firefox version 3.0.8 and when I go to highlight anything with my mouse (Like moving from left to right while holding down the button on my trackpad which should highlight the text) it highlights, but the whole window for mozilla firefox moves too, even if I have the text box in use, it does happen with other programs

 

[pkagel]

mine works fine. try reloading FF

 

[ikermalli]

This is so weird, I didn't even have to, and now it is working fine again...?