Importing Dictionary

Allows users to import their dictionary from another profile to their current profile.

Compatibility

Works with: Firefox 3.6+

Background

Users can port their customer dictionary from another profile or Firefox install.

The Tweak

To move Firefox dictionary to another profile:

1. Close Firefox (Firefox saves the dictionary file upon closing)
2. Navigate to your old profile folder
3. Copy the file persdict.dat
4. Navigate to the new profile folder
5. Paste and replace the persdict.dat file
6. Restart Firefox

Original Article

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Updated: November 15, 2025