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Sometimes, my Firefox 4 beta 10 crashes and after restart it does not recover last opened tabs.

In my Firefox 3 it functioned always.

Someone knows how to fix it?

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Well, it's called "Beta" so crashes and malfunction are expected. I'd suggest you report them to the Mozilla Bug Tracker – bruno077 Feb 2 '11 at 13:06
I know what means "beta", but wanted to solve it, perhaps with another beta, a "more stable one". – kokbira Apr 11 '11 at 19:26
Firefox 4 final has been released, so you might as well update – bruno077 Apr 11 '11 at 19:28
I downgraded to Firefox 3.6 + ( Tabs on Top + Hide Caption Titlebar Plus).addons => So I have the benefits of FF4 appearance and all add-ons that are compatible with 3.6 but not with 4. – kokbira Apr 12 '11 at 20:46
up vote 2 down vote accepted

In the General tab in Preferences, you might want to set When Firefox Starts to Show my Windows and Tabs from Last Time. It's very possible that Firefox 4 (which, as bruno077 reminded us, still is in beta) isn't registering the fact that it crashed correctly.

Also, make sure that browser.sessionstore.resume_from_crash is set to true and that browser.sessionstore.max_resumed_crashes is greater than or equal to one in about:config.

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i've done that, but after RC releases the issue disappeared... – kokbira Apr 11 '11 at 19:27

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