The extension was last updated June 6, 2023. It may be incompatible with the latest Firefox version you have installed. Go to the page on the add-ons site and file an issue if you can't fix it.

''<p>macjohnw [[#question-1426119|said]]</p>'' <blockquote>My Lastpass extensions icon has also vanished.</blockquote> Extensions need [[Extensions in Private Browsing#w_enabling-or-disabling-extensions-in-private-windows|permission to run in private windows]] when the browser is in [[Private Browsing - Use Firefox without saving history#w_can-i-set-firefox-to-always-use-private-browsing|private browsing mode]].