LastPass Not Working in Firefox? It's Not Just You


LastPassFinds of the WeekThe 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 horizontal 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. :)

You can find more Tech Treats here.


Please rate this article: 

Your rating: None
Average: 4.6 (84 votes)


Version stopped working as of today. Same symptoms. Lastpass add-on on FF doesn't render window and stops other extensions and the whole browser from working.
Rolled back to Version using instructions on this post and works like a charm

Thanks for the information. I installed it recently and it was doing ok for a bit so I uninstalled it. It looks like this will be an ongoing hiccup.

LastPass has a new update that resolves the empty Recently Used issue.

I haven't had any issues myself with FireFox 64 and LastPass other than that.

You might find that the new update fixes things.

Thank you, I'll have another look at it. I stopped using LastPass not long after this article was posted and have been using Bitwarden ever since. ¯\_(ツ)_/¯

May 4, 2019 - New Firefox immediately fails download for 4.7.1 LasPass as well as any other LastPass. Says it's not a verified Add-on. FireFox IS THE PROBLEM. Will be using EDGE and it's terrible!

There is an issue with Firefox and a certificate. Not everyone is impacted by the issue and fixes are rolling out.
You can read about it here:

or Mozilla's Twitter:

I used this add-on at Hacker News/ycombinator and it worked for me.

I would read the thread and make your own decision whether to install the add-on or wait for Mozilla to roll out a fix for everyone. I'm fine with what the add-on does and the mechanics underlying the changes it makes.YMMV.

And of course, feel free to use Edge or any browser that you choose.

Personally, no browser is perfect, they've all had problems more or less severe over the years.
When Mozilla became aware of what happened they let people know and started on a fix and are keeping people updated.

If you check the article above, please note that I've added a site with directions on using Chrome extensions in Edge, so if there's a favorite Chrome extension you can now use it with Edge.

You can also consider a fork of Firefox such as Waterfox or Pale Moon.

The fix for the problem with Firefox extensions is now out and working, see the Mozilla blog here -

I'm assuming you're talking about the certificate issue with Mozilla that caused all add-ons to be disabled and labeled as Legacy last night and today?
They haven't rolled out a fix yet for everyone, and not everyone is impacted.

I came across an add-on that fixed the issue at Hacker News/ycombinator. As far as I can tell it can be left in place indefinitely. I recommend reading the thread and deciding whether to install it or not. I checked what was being changed and I'm ok with the mechanics of the fix.
I don't have studies enabled, and at this point, current information is saying if you enable studies it could take 6 hours to work unless you change the interval that Firefox checks for updates (every 6 hours).
Hacker News:

I started having stability problems with LastPass in Win 7 at least 8 months ago. I found Bitwarden after a search added to Firefox and synced with LastPass without issue.

I haven't looked back since.

I'm using Firefox 62.0.3 (64 bit) on a Mac laptop running High Sierra. I was getting this same issue where when clicking the Lastpass icon in the top right you should see a menu expand. It was not expanding and only showed a small white box.

I noticed that I had my browsing history set to Never Remember history in Privacy & Security settings. This turned out to be the issue. As soon as I changed to Remember history Firefox asked me to restart. Once Firefox had reopened Lastpass was working fine just like on Chrome.

Has anybody else had this? Why would Lastpass require the browser to remember history for the application to work?

That's interesting. I have remember history enabled.

I don't have any idea why history would be need to be enabled for LastPass to work. Maybe someone has an idea?

Hi Rhiannon

The LastPass extension sets four cookies, has its own cache and uses a "hidden" cookie-type file under a GUID to store user preferences and probably the trusted device details, so setting the browser to block or remove history and site info would, I think, be bound to interfere wth LastPass functionality.

Good to know about the cookies, thanks. I'm not understanding why setting history to not remember would make a difference to the cookies that LastPass sets. I've cleared site history (everything, not just recent) and cache and LastPass still has me logged in.

Clearing history is user-definable but the default settings include cookies and active log-ins so unless the user changes that then I think it's possible that simply opting to not remember history might prevent them being set, or atleast interfere with proper functioning.

That makes sense. :)

Every so often, I export all of my passwords to a file which I password-protect with 7-zip and upload to the cloud. Just in case...

I export all my LastPass content on a regular basis. Just in case. :)

[of course the hamburger' symbol is the set of three *horizontal* lines near the top of our browsers, unless it's been gender-modified]

With a little persistence, Lp will behave and heal itself now, mid-2018, even if it appears flawed at first.

Good catch. Thanks. Fixed it. If you knew how many times I proofread that you might think I couldn't read. :)

I've been using the latest updates for a bit now, sometimes it works fine, then an upgrade, then it's repeating the previous behavior. That includes a clean Firefox installation with no other add-ons. I'm keeping an eye on it.

Hi everyone!

Because I usually do not agree to work with outdated versions for whatever, I tried different ways to solve that. One that I found working with the latest add-on in quite simple. Click right on the add-on icon in toolbar. On top of pop-up window will be "lastpass". Click on it will open the login page and after login everything work just fine!

[email content removed as per site rules for security reasons]

Thanks for the tip.

Just read this, and although a bit old, it's good advice. I have Win 7.Updated from 4.2 to 4.71 and turned off updates.

If you look at LP's forum, you'll see that this program has become very buggy, and the new owners, LogMeIn, aren't keeping up with the fixes.

Every time I update, as little as possible BTW, I'm aware I can be trading old bugs for new. I run LP and Dashlane at the same time, because they're both buggy. Until I find a PW manager that's not.

I agree. I haven't updated it just yet because so many people are still reporting issues at the Last Pass site and the add-on site at Mozilla.
I haven't tried Dashlane or 1Pass.

I have tried to download LastPass several times but no luck. It just freezes on my Windows 10 OS. Very disappointing after all of the glowing reports about LastPass. I have used RoboForm for years but it is developing its own issues such as failing to enter passwords at all, not saving new passwords, etc. I hoped that LastPass would be a good alternative but it was not to be. Does anything work anymore?

It's working on Chrome, Vivaldi, Opera, and Firefox (with changes as above) on my Windows 10 system, but, I haven't downloaded any of the major Windows 10 upgrades recently.

I understand the frustration.

I have 4.9.0 and it was acting up last week, especially when I used a Private Window, but seems OK now.
Can anyone explain what the INSTALL BINARY COMPONENT button on the "About" page is all about??

This might shed some light, though I'm still not sure what the binary component is. This is more along the lines of what it does:

LastPass - What does binary support for extensions mean?

The binary component is a desktop installation of the necessary components to enable communication between browsers for things such as sharing login states between browsers and logging out automatically when all browsers are closed.

Thanks. :)