The latest LastPass Firefox update (version 4.9.0) is causing the LastPass Firefox add-on to stop working in several versions of Windows (from Windows 7 to Windows 10) and several versions of Firefox. Here's a work around to keep it running.
If you use Lastpass on Firefox, Waterfox. Cyberfox, Pale Moon or another Firefox fork and it doesn't respond when you click on the LastPass toolbar icon, it's not just you. Not only is there no response when clicking on the icon in the toolbar but none of the usual pop up options appear below the icon. There are several reports from users indicating this is a Firefox issue, as Chrome, Vivaldi and Opera are not experiencing problems with the add-on so far.
As yet there's been no word from LastPass about this, but luckily there's a work-around.
First you'll need to remove the current LastPass version in the Firefox add-on section. Use the three vertical line "hamburger" menu at the top right and choose Add-ons, find the Last Pass entry, and click Remove.
Next, download version 4.7.1 from the LastPass Password Manager Version History page at the Firefox Add-on site by clicking the +Add to Firefox button next to version 4.7.1.
Once it's installed, you'll need to disable the add-on from updating, or it will update and stop working again.
To disable the update, go to Add-ons using the three vertical line menu at the top right and clicking on Add-ons, then make sure you're in the Extensions section using the menu at the left. Find the LastPass: Free Password Manager entry, and click on "More". It's right under the Last Pass Free Password Manager title.
Then, scroll down to the bottom, and when you see Automatic Update, click the Off button.
That will stop the add-on from updating and will let you use Last Pass without any issues until the issue is fixed.
That should keep your LastPass add-on working until the issue is fixed. I'll keep an eye out and when I know something, I'll pass it along. When it's resolved, you'll have to uncheck the button and allow the add-on to update. It should do so automatically, but if not, you can install the latest version by visiting the LastPass add-on page.
Update: 4 April 2018
No response from LastPass as yet. Their forum is viewable here: LastPass Forums • View topic - Firefox Extension won't open
Note that version 4.7.1 of LastPass was available for download this afternoon at places like File Hippo, where there are earlier versions, but when I looked this evening, only the newest version was available. Earlier versions can only be found at the Mozilla Firefox site as far as I can tell. All major download sites are now showing version 4.9.0.
That's it. :)
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