Comment 1 for bug 81191

Thanks for the report.

Unfortunately we'll need more info than that, I know it's random but anything you can think of helps. Are you running other things (high cpu usage), is it always the same page you leave it running on? What version of Ubuntu are you using? etc.

Also if you could install the Firefox-dbg package and obtain a crash report the next time and post it here we could really use that to help us. If you need to know how to do that please check out https://wiki.ubuntu.com/DebuggingFirefox