Firefox has disabled the Lastpass add-on, saying that it has not been properly signed.

Question

fb.shahsyed · Answer

* Update LastPass: Ensure you’re using the latest version of the LastPass add-on. Older versions may not meet the current signing requirements of Firefox.
* Reinstall the Add-on: Uninstall the existing version and download it again from the official LastPass website.
* Update Firefox: Make sure your Firefox browser is updated to its latest version, as outdated versions can sometimes conflict with add-ons.
* Debug Mode (Advanced Users): If you’re comfortable with manual installation, you can enable "Debug Add-ons" in Firefox and load the add-on manually.

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jepenny · Answer

Remove the extension from about:addons and reinstall it.

https://www.lastpass.com/download/

john · Answer

That worked.  Thanks!