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If Firefox crashes, and upon restarting Firefox, fails to recognize and reload tabs and pages which were open when it crashed, can they still be recovered?

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I tend to use a lot of open tabs for research and leisure, and instead of closing them all, I tend to close fire fox and click "save" to reload them all simultaneously when I open Firefox again. Some times it crashes, but whenever it does, it normally saved and reloads my tabs as they were before with a little window saying "Well, this is embarrassing" etc. This time, it didn't. It's done this once before, but after opening several windows, with several tabs, across a day or two, it finally "kicked in" with the an error window that allowed me to choose between reloading/recovering all my tabs, or starting a new session. This is the second time, it's been 3 days and it still hasn't recovered the lost tabs. Are they gone for good? Also of note, it crashed while updating to a more recent, but not the most recent version of fire fox. When I reopened Firefox 3 days ago, it said "welcome to the latest version" etc, but had no side tab with the restore/or/start new session buttons as it normally does after a crash.

I tend to use a lot of open tabs for research and leisure, and instead of closing them all, I tend to close fire fox and click "save" to reload them all simultaneously when I open Firefox again. Some times it crashes, but whenever it does, it normally saved and reloads my tabs as they were before with a little window saying "Well, this is embarrassing" etc. This time, it didn't. It's done this once before, but after opening several windows, with several tabs, across a day or two, it finally "kicked in" with the an error window that allowed me to choose between reloading/recovering all my tabs, or starting a new session. This is the second time, it's been 3 days and it still hasn't recovered the lost tabs. Are they gone for good? Also of note, it crashed while updating to a more recent, but not the most recent version of fire fox. When I reopened Firefox 3 days ago, it said "welcome to the latest version" etc, but had no side tab with the restore/or/start new session buttons as it normally does after a crash.

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I have a similar problem. Recently my FF8 has been crashing a lot. It regularly locks up an entire core of my PC and often just shuts down. It has just done it a moment ago and when it started back up it did the whole "this is embarrassing" thing and asked me if I wanted to reload my tabs. I deselected the one that I was trying to view as I suspected that it may have been the cause (unlikely; it was node4.co.uk) but anyway, let's skip it just in case. Click on the button to restore and up pops my homepage only. So all of my other tabs, which I was using for work incidentally, are gone.

This is not the first time this has happened on FF8. It happened a lot recently on FF6 I think it was (so hard to keep track now, Mozilla) and I switched to Chrome as a result, but it turns out that it crashes even more than FF6 did. FF7 was a vast improvement but FF8 is so unstable/unpredictable for me at the moment that I think I'd rather use IE9 than this. It's driving me mental, clearly! I wish I could kill the process manually and have it retry restoring tabs. Hey, there's an idea Mozilla; give us a menu item that allows us to restore the session to how it started to try again or at the very least get a list of the pages we were looking at. They don't show up in Recently Closed Windows and the Restore Previous Session is greyed out too. Gah! Help!