I have Firefox 5.0 set to start on a blank page. However, about 50% of the time, instead of starting on a blank page, it starts by showing the pages of the last session. How do I correct this, or is it a known bug?

Tools > Options > General > Startup > When Firefox starts: Show a blank page. (I.e., Show my windows and tabs from last time is NOT set.)
Firefox does not crash when exited the previous time. However, about half the time, when I start Firefox again, it shows the last websites I visited, despite the startup setting.
Feel free to write me if you need any extra info.

Perhaps your install of Firefox is hanging on exit, triggering the session restore.
You can disable session restore by changing a hidden preference.
Type about:config into the location bar and press enter
Accept the warning message that appears, you will be taken to a list of preferences
In the filter box type resume to bring up a small number of preferences
Double-click on the preference browser.sessionstore.resume_from_crash to change its value to false
*solution courtesy TonyE
https://support.mozilla.com/en-US/questions/754840

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