Fix Last Pass Freezing Firefox

Martin Brinkmann
Jul 15, 2010
Updated • Apr 24, 2014

My morning routine begins with a cup of good coffee, booting the PC and firing up the email client Thunderbird to check the past 10 hours of emails, and the web browser Firefox. Firefox behaved strangely this morning, it simply would not load properly but hung whenever I s started it on the system.

The tabs of the websites that were open in the last session were showing up but they were not loading at all. Killing the Firefox process and restarting the PC did not help.

Since this is not the first time Firefox acted up I started to troubleshoot the issue by disabling all add-ons to see if an add-on was the culprit. Firefox ran fine with no add-ons running in the background so that I knew that it was add-on related.

Pro Tip: To start Firefox's Safe Mode, hold down the Shift-key on your keyboard before you click on the Firefox icon to start the browser.

I then enabled one add-on at a time to see which one was causing the hangs.

I found out that the password manager add-on Last Pass was the problem. I then remembered that I had the same problem about a month ago (see Fix Firefox With Last Pass Not Responding), and checked the Last Pass forums for news on the topic.

Some users were reporting problems with Last Pass, most of them were running a 64-bit edition of Windows 7, just like I do.

The solution was simple. Download the non binary version of the Last Pass add-on, and drag and drop it into the Firefox interface to install it. You need to disable the Last Pass add-on first so that the web browser starts up normally.

I'm not sure what the problem is exactly but the Last Pass guys should consider fixing it, as it is an annoying experience to witness the freezes every time the add-on updates automatically in Firefox.

One of the things that may play a role here is that the company does not seem to update the add-on on the Firefox website as often as it is updated on the LastPass website.

A good place to start the troubleshooting is the LastPass website therefor to check if you are running the latest version of the extension or if a new one has been released that has not been made available on the Mozilla website and as a consequence not via the browser's automatic update feature.

Now Read: Why is LastPass not updated on the Mozilla Add-ons repository?


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  1. Gerald said on November 10, 2013 at 1:38 am

    Should be “update option” without “auction.”

  2. Gerald said on November 10, 2013 at 1:06 am

    One minor problem that LastPass should correct is updates. I had the same problem with Firefox and Facebook. LastPass changed drastically in appearance, but Firefox Add-ons still listed it as 3.0.1. It appears that and update was needed without any notification. To check for updates in its almost hidden position, click the LastPass icon, look for Tools, find Advanced Tools and then find the update auction option. My problem appears solved, and Add-ons shows 3.0.6 as the current version.

  3. Tech Checkers said on November 8, 2013 at 11:35 pm

    Last Pass (3.01) with the latest Firefox (Release 25 ) is a terrible experience, freezes, crashes and generally unusable – Fortunately there is a Solution:

    Firefox -> Tools -> Add-ons and Uninstall Lastpass, now open this webpage:

    And re-install/add to Firefox and Resolved.

  4. Anonymous said on October 2, 2013 at 12:36 pm

    This issue seems to have been addressed with v2.5.0 x64 installer for Windows.

  5. Ulcer said on December 8, 2011 at 5:16 am

    Hey I began having problems with Firefox recently around the time I got Last Pass, so I was lucky enough to figure out what was causing Firefox to hang. One Google search brought me here, and I haven’t had any problems since.

    Thank you very much!

  6. andrea melms said on October 25, 2010 at 1:43 am

    I cant login to my fb. It only redirects me back to the login page after i have already tried logging in. I check my fb via my mobile phone. I’ve never had this problem before. Now, for the last week, i’ve had login troubles. FB IS THE ONLY WAY I CAN COMMUNICATE WITH RELATIVES OUT OF TOWN!?! HELP! HELP! HELP!!! Please fix it! I love fb & would hate to delete my acct! Please fix this annoying problem!!

  7. bf said on July 15, 2010 at 9:09 pm

    I had to uninstall Firefox and all add ons and reinstall everything again. Problem is fixed, but what a timewaste.

    1. Martin said on July 15, 2010 at 11:04 pm

      Why did not you run Firefox in Safe Mode?

      1. bf said on July 16, 2010 at 12:03 am

        I had other problems with Firefox. I have 84 extensions and 30 something scripts, so something was always broken. Surprisingly I have much fewer crashes after complete reinstall. On other hand, couple of new annoying bugs seem to be introduces with AdblockPlus and Stylish conflicting.

  8. Davin Peterson said on July 15, 2010 at 3:27 pm

    I use the software KeePass and it has a toolbar for Firefox. I’ve not had any problems with it.

  9. kman said on July 15, 2010 at 3:25 pm

    I too suffer with this exact same problem. I’ve actually had some success with changing the Compatibility Mode on the firefox.exe to XP SP3. Who knows what all else that affects, but it definitely lessens the number of freezes I get. Notice I said “lessens”, as I still get an occasional freeze, but it’s nothing like the several-times-a-day freezes I previously experienced.

  10. Thomas said on July 15, 2010 at 9:57 am

    I know this problem, as I’m a add-on victim too. With ~40 add-ons it is not easy to detect the faulting one. Last Pass is not on my list, so I’m not affected with this one. Until now I use the built in pw-manager with a own password.

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