DSL or Firefox one is giving me fits

for the past couple weeks I have not been able to pull up the web site to go to any web page, but i've been able to check my email. so I was thinking firefox was giving me fits.

Sometimes it works sometimes it doesn't.

This morning both firefox and my email wouldn't work, I havne't a clue but it's ALL the time. while i'm in the middle of working on the computer I cannot get to the next page because firefox wouldn't open that window, or sometimes a box would appear and say your working off line go to file and click the work off line tab, and I never clicked that in the first place.

I'm getting sick of it. wondering if I should go back to IE or if it's actually my dsl box not working properly.