I use Lastpass on two different browsers (Mozilla and Google Chrome) with two different ID's on each browser. I don't use the Firefox ID on Chrome and vice versa. But today something strange happened. After using Firefox and logging into Lastpass, my Firefox ID was automatically filled in Chrome. How is this possible?

AFAIK, Chrome cannot read anything that is stored by Firefox extensions or cannot read Firefox cookies. So is Lastpass really connecting my IP address with my login ID?

From this answer it looks like there is a ~/.lastpass directory which is used by the Firefox extension. So it looks like the Chrome extension is reading data from it. Is that possible? I'm on Linux.

EDIT: From this answer on the Chrome discussion forums it seems very clear that Chrome extensions cannot read any external file, and can only access its local storage. I'm intrigued more now.

  • 1
    I've pinged their support to this question. Your usage is very unusual.
    – dnbrv
    Jan 14, 2012 at 17:13
  • I'm not sure why you would be using two different accounts but I believe LastPass is meant to sync with the other browsers. It's meant to allow you to switch browser to browser and computer to computer without much trouble. I'm assuming this is just one of the built in features. I'm not sure how they are going about syncing these two browsers therefore I did not put this as an answer. Jan 15, 2012 at 23:00
  • @Fogest, I don't understand why this shouldn't be an issue. I use two different Lastpass accounts on two different browsers mainly for security/privacy reasons - throwaway accounts on Chrome and banking/cc information on Firefox. And I hardly think this a 'feature'. I'm concerned about the Chrome extension seeing my Firefox Lastpass ID, when I never use it on Chrome.
    – pewfly
    Jan 16, 2012 at 6:07
  • @pewfly Lastpass has a Univseral installer option. If you chose to install this, then that is probably the reason that Chrome can see it. If you simply installed ONLY the extension on each then it's odd that it's doing that. Jan 16, 2012 at 13:48
  • @Fogest Nope, I am on Linux for which there is no universal installer. And I haven't used Lastpass on Windows PCs.
    – pewfly
    Jan 16, 2012 at 14:04

1 Answer 1


There's a setting in LastPass preferences called "Share login state between other browsers". It's located in the advanced section (list on the left). Uncheck it & save the settings.

  • Yes, I think this was the root of the problem. But I still wonder how Lastpass manages to share the login state between other browsers.
    – pewfly
    Jan 17, 2012 at 8:24
  • Local storage. I guess, it's that .lastpass folder.
    – dnbrv
    Jan 17, 2012 at 19:01
  • AFAIK, your Lastpass vault is only stored once on a computer, regardless of the number of browsers using it.
    – MBraedley
    Jan 18, 2012 at 22:27

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