I lose saved tabs after closing Firefox 7.0.1/Vista

I have configured FF through Options to save tabs when closing. I shut down my system every night, and approximately once every 2 weeks when restarting FF it can't recover my previous session. The "We're embarrassed..." window option to restore tabs is grayed out. History... Restore Previous Session is grayed out, so I can't restore that way. Closing FF and restarting it doesn't solve the problem. I am also experiencing crashes once every 1-2 weeks. Is this loss of saved sessions a known bug?

A possible cause is an update of Firefox.
If you notice an update then try to close Firefox via Firefox/File > Exit instead of clicking the Apply Update button.

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== This happened ==
Every time Firefox opened
== about a couple months ago and happens every time I close Firefox.

'''Kill Application'''
In Task Manager, does firefox.exe show in the '''Processes''' tab?
See: '''[http://kb.mozillazine.org/Kill_application Kill Application]'''
'''Causes and solutions for Firefox hanging at exit:'''
'''[[Firefox hangs]]'''
'''[http://kb.mozillazine.org/Firefox_hangs#Hang_at_exit Firefox hangs at exit (Mozillazine article)]'''
'''[[Firefox is already running but is not responding]]'''
'''Safe Mode'''
You may need to use '''[[Safe Mode]]''' (click on "Safe Mode" and read) to localize the problem. Firefox SafeMode is a diagnostic mode that disables extensions and some other features of Firefox. If you are using a theme, switch to the DEFAULT theme: Tools > Add-ons > Themes before starting Safe Mode. When entering Safe Mode, do not check any items on the entry window, just click "Continue in Safe Mode". Test to see if the problem you are experiencing is corrected.
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'''[[Troubleshooting extensions and themes]]'''
'''[[Troubleshooting plugins]]'''
'''[[Basic Troubleshooting]]'''
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'''''Other Issues''''': to correct security/stability issues
'''Update Java''': your ver. 1.6.0.19; current ver. 1.6.0.20 (important security update 04-15-2010)
''(Windows users: Do the manual update; very easy.)''
See: '''[http://support.mozilla.com/en-US/kb/Using+the+Java+plugin+with+Firefox#Updates Updating Java]'''
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See:
* http://kb.mozillazine.org/Recovering_a_missing_profile
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*http://www.superantispyware.com/ - SuperAntispyware
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* http://kb.mozillazine.org/Testing_pre-release_versions
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''(If you're not using it, switch to the Default theme.)''
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* On Mac you can open Firefox 4.0+ in Safe Mode by holding the '''option''' key while starting Firefox.
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[[Image:FirefoxSafeMode|width=520]]
''Once you get the pop-up, just select "'Start in Safe Mode"''
[[Image:Safe Mode Fx 15 - Win]]
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Hello, I just signed in because I have a weird issue, so this is my first post here:
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Here are my specs:
Windows 7, 64-bit
Firefox, ver. 17.0.1
Adobe Flash Player, ver. 11.5.502.135
(PS: While writing my specs, I was just wondering if it was a problem with Firefox, which updates quite frequently... go figure.)

What? No replies? Anyone?
Well, I just wanted to add that the problem seems to be with Firefox. I tried opening videos with Internet Explorer 9 and they stopped buffering the moment I closed their tabs or closed the browser, so I downgraded Firefox from ver. 17.0.1 to ver. 16.0.2 and I thought the problem was solved, the videos stopped downloading as soon as I closed them, but the next time I opened Firefox the problem was there again...
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