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After having to shut down unexpectedly, I get the following error message (no bookmarks/back button): "The bookmarks and history system will not be functional because one of Firefox's files is in use by another application - some security software can cau

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I had to shut down unexpectedly, and at first it was able to recover the tabs but I have no back button or history toolbar. I followed all the possible fixes, but no luck. I also tried re-downloading firefox, but still no luck.

User Agent

Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.5; en-US; rv:1.9.2.7) Gecko/20100713 Firefox/3.6.7

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Here is the troubleshooting info: Application Basics

browser.startup.homepage_override.mstone	rv:1.9.2.7

extensions.lastAppVersion 3.6.7 network.cookie.prefsMigrated true privacy.sanitize.migrateFx3Prefs true