FireFox BrowserPlugIn says: wrong password

Let's try completely removing and reinstalling the Firefox extension. Other browsers handle the removal of the SQLite file automatically, but you will need to do this manually for Firefox:

1. Open Firefox.
2. Remove the 1Password extension.
3. Enter about:support in the address bar and press Return.
4. Click the "Show Folder" button.
5. Quit Firefox.
6. In the Explorer window that opened, go up one level in the file hierarchy.
7. Move the OnePassword.sqlite to your desktop.

​Then reinstall the Firefox extension from 1Password for Windows' preferences on the Browsers tab.

Once everything is working well, you can safely move the OnePassword.sqlite file on the desktop to the trash.