Firefox Acting Weird

[shafe88]

Why does my firefox stop responding for about 1-2sec with a white screen with 2 blue squares, both in the middle of the screen, one almost at the top and one almost at the bottom. The blue squares does writing or something, but cant tell.

 

[Hawkeye22]

This sounds like an addon that you installed in firefox as I've never noticed this behavior. Does it do it with all sites or just certain ones?

 

[shafe88]

I don't know what happened, but after I closed most of my tabs, fire fox still stops working, just that firefox is black now instead of the white with the two blue boxes.