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Firefox appears in processes then randomly closes

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Was browsing websites yesterday when a .pdf document was opened, Firefox hung for a few seconds, then crashed, went to open it up again but it just wouldn't startup, no window appears and then I checked processes. Once clicked it appears for i'd say no more than two seconds and then dissapears from the list.

User Agent

Mozilla/4.0 (compatible; MSIE 6.0)

Was browsing websites yesterday when a .pdf document was opened, Firefox hung for a few seconds, then crashed, went to open it up again but it just wouldn't startup, no window appears and then I checked processes. Once clicked it appears for i'd say no more than two seconds and then dissapears from the list. == User Agent == Mozilla/4.0 (compatible; MSIE 6.0)

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I fiddled around with it last night, I'm the administrator on my system so I tried the only other profile on my computer. Firefox worked without any problems what so ever, so I then went on to try on my profile again, it worked no problem however I didn't close it at all. Came back on this morning, it will no longer on my profile again yet is still completely fine on the other profile (from which I am posting this on) can anybody help?