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by auganov 1946 days ago
Most immediate concerns:

   - you're leaking the list of websites
   - even if you encrypt everything you'd still be leaking the fact of adding/removing something
   - if your one password gets compromised all the others do
   - rouge extensions
   - keyloggers 
   - you're making yourself a target
If you host this behind a server-side login screen I think it's fine (besides browser vulnerabilities).