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I'm on a MacBook Pro. Can I install the Dashlane extension on Tor Browser? How?

When I try through Dashlane it says: "Update error. Retrying in a few minutes," but the message never goes away, and Tor does not appear in the browsers listed in Preferences, that I could click to have Dashlane install the extension.

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If I can/do install the Dashlane extension, do I remain anonymous?

Dashline is a closed-source, third-party add-on. As the source code isn't available, you have no way of knowing what it's doing. It could be bypassing any proxy settings, including Tor entirely, revealing your real IP address. Add-ons also add to your unique browser fingerprint.

Add-ons and extensions are generally recommended against for exactly these reasons.

The same argument can be used to explain why using vanilla Firefox proxied through Tor - instead of the Tor Browser Bundle - is a bad thing. You don't know how Firefox might by bypassing the proxy. (For the many anonymity-related changes that have gone into the Browser Bundle, see the Browser Bundle Design document. See here for an associated discussion.)

If you really have to install the add-on, then try first allowing add-ons in the config:addons settings, as per these instructions.

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Use a regular Firefox browser connected to Tor via FoxyProxy, don't use a bundled one. It's a different version : old version with backported patches from new ones, so it's API/behaviour is odd sometimes, and it does not allows some extensions to work normal. feel free to ask if you have further questions

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  • See @Richard's answer why this might not be the preferred solution. Commented Jan 3, 2016 at 17:02
  • @AndrewLott In My Humble Opinion any password manager is evil : it can be ten times open-source, but hacked and all your passwords are Gone with the Wind(ows) =)
    – Alexey Vesnin
    Commented Jan 3, 2016 at 17:22
  • This is why Tails includes KeePassX, storing passwords in an encrypted database on an encrypted device. Commented Jan 3, 2016 at 19:53

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