Similar to the following: http://support.mozilla.com/pl/forum/1/627872?s=window+7+crash&as=s but not sure whether it depends on pages that are currently opened. Sometimes, when recovering from sleep mode on win7 (with only Firefox and VS2008 running), win7 crashes. What's important - It doesn't happen always, but still, it's annoying (Firefox starts with startpage only). I've been noticing this issue on different Firefox versions from Firefox 3.5 to 3.6.6.