Sounds like an add-on issue and not a browser issue. Looks like that add-on was last updated a month ago (Nov 21, 2025). Try their site. https://addons.mozilla.org/en-US/firefox/addon/lastpass-password-manager/?utm_source=addons.mozilla.org&utm_medium=referral&utm_content=search Interesting... Is there a reason you're not using the built in option in Firefox instead of relying on an add-on? Curious minds want to know.  ;-))

I have version 4.150.1 - the exact same version listed in the Chrome Web Store updated Dec. 11, 2025. Your link is to 4.149.3 so that does not help me.

For curious minds: I have to use different browsers for different tasks and this is also for a few passwords at work. I have the mobile app for work and the browser extension for home. Plus there a hundreds of entries with notes for which browser will work with what site.

I use LastPass and I cannot open any login information from the vault. I click on "Launch" (picture uploaded) and nothing happens.

Right, just showing you that the add-on has not been updated like the one for chrome. Your issue is with Lastpass and not the browser. Ping them and ask for an update to their add-on that is not working.

Password manager not launching

LastPass is not lauching...