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Best extension ever Rated 5 out of 5 stars
For anyone who manages lots of online accounts and cares about security, this is hands down the best extension you can ever learn how to use.
It does have a small learning curve, but it is well worth it.
Ops: you can create your own custom character set, or edit one of the existing ones... and if you care about security, you shouldn't share your user account with anyone else anyway... and having an encrypted settings file is high on the Feature Request list.