Random crashes - even with Add-ons disabled ... how to fix?
Firefox randomly crashes and needs to be restarted, at least every 2 hours or sooner. I've tried reinstalling it, disabling all add-ons (still happens), deleting/reinstalling Flash. I'm running Windows Vista on a desktop Dell.
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https://support.mozilla.com/en-US/kb/Firefox+crashes#Getting_help_with_your_crash
Type about:crashes in the URL bar and hit Enter.
Click the hyperlinks to bring up the Crash Report pages and copy'n'paste the URL of each of those reports into the message box here. We'll see if we can help you figure out what is causing those crashes to happen.