HT5557 Why do I get a Message "Unable to Open Book" and how do I fix it?

Why do I get a Message "Unable to Open Book" and how do I fix it?

This issue can be caused by the presence of leftover files in the Firefox program folder (defaults\pref) like a file firefox.js that overrides the update URL with a wrong link.
Do a clean reinstall and be sure to remove the Firefox program folder to remove the file(s) that cause the problem.
Your bookmarks and other profile data are stored elsewhere in the Firefox Profile Folder and won't be affected by a reinstall, but make sure that you do not select to remove personal data if you uninstall Firefox.
* http://kb.mozillazine.org/Profile_folder_-_Firefox
See:
* [/questions/826858]

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