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I'm considering upgrading from Firefox 3.6.3 to Firefox 9, but concerned that I'll need to rebuild my Awesome Bar database from scratch. Is this a legitimate concern? Or will my current database be migrated?

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Firefox stores that sort of information inside a separate profile folder, which keeps track of all your personal settings, bookmarks, and history. This also means that it's kept separate from the install, so installing a new version shouldn't affect it.

To be absolutely certain, you can first make a backup of your places.sqlite file inside your profile folder, and then restore it if the upgrade doesn't keep it.

Older versions of Firefox used two separate files for bookmarks and history: bookmarks.html and history.dat. Starting with Firefox 3, however, they switched to using the single places.sqlite file. If you were coming from an older version of Firefox. It would be hard-pressed to keep it, but since your Firefox is newer than Firefox 3, you shouldn't have any trouble upgrading.

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Uninstalling the old Firefox won't touch the Firefox profile which contains bookmarks, cookies and such. – Lekensteyn Dec 22 '11 at 21:10
Ah, okay, I wasn't sure about that. I'll change it. – SaintWacko Dec 22 '11 at 21:11
To delete your Firefox profile at un-installation, you have to select the Remove my personal data option. – iglvzx Dec 22 '11 at 21:24

If you want to be extra cautious, you could upgrade your Firefox incrementally. Mozilla maintains an archive of all public releases at:

So, in your case, to upgrade from Firefox 3.6.3 to 9.0:

  1. Download and install Firefox 4.0
  2. Download and install Firefox 5.0
  3. Download and install Firefox 6.0
  4. Download and install Firefox 7.0
  5. Download and install Firefox 8.0
  6. Download and install Firefox 9.0
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