If you go to about:crashes, can you click the crash report to submit it, and then give me the number that starts with bp?

sure, its:

bp-d763225d-a004-4e6c-9a95-a92342130116

Are you unplugging or plugging in a pair of USB headphones? That has been mentioned as a possible cause.

Also, reset Firefox. Refresh Firefox - reset add-ons and settings

Nope no headphones being plugged in or out but it looks like resetting FF has stopped it crashing. Fingers crossed!

Hi there, everything was working fine after resetting firefox yesterday but now when I turned on my machine this morning its back to the same way again. Crashes instantly as soon as I navigate to most websites.

I have no plugins or anything else running, its basically vanialla FF 18.