Hey Firefox users! You may have noticed that with the latest update to Firefox 43, extensions must now be “verified” in order to be enabled in the browser. Upon restarting Firefox, you may have noticed that LastPass was disabled with a warning about not being verified:
Good news: LastPass is verified when you download the latest version from the Mozilla addons store (AMO). All you need to do is remove the version of LastPass you have installed from your extensions panel (Firefox Tools menu > Addons > Extensions tab) and then install LastPass directly from AMO here: https://addons.mozilla.org/en-US/firefox/addon/lastpass-password-manager/
Firefox is now requiring that all extensions be signed in an ongoing effort to fight malware and protect its users.