How to recover?
- Choose Start → Run
- Type in %APPDATA%
- Press OK. A Windows Explorer window will appear.
- In the Windows Explorer window, choose Mozilla → Firefox → Profiles. Each folder in this folder is a profile on your computer.
- Open the Firefox profile folder and delete (or rename) the "places.sqlite" file and the localstore.rdf file.
- Open the bookmarkbackups subfolder and remove any .json files to another location (or rename).
- Restart Firefox.
Firefox 3 will then automatically import the bookmarks from "bookmarks.html" in the profile folder.
Reference: 1
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