Windows 8 and 8.1 Forums


Firefox crashing on every launch!

  1. #1

    Firefox crashing on every launch!


    Yesterday, my Firefox in Win8.1 64-bit automatically updated from version 34.0.5 to v35, and ever since, it has been crashing every time I launch it. Offers to send info to Mozilla, which I accept, and then click restart. And, it crashes again a couple of times and then offers to be restarted in safe mode -- which then works.

    I have disabled ALL of the Add-ons and Extensions, and regardless of the page being opened, it still crashes.

    I've read that lots of folks are experiencing this, but I've not seen any posts here about it.

    To confirm the problem, I uninstalled FireFox, downloaded an older version (34.0.5), reinstalled it, and using the same Add-ons and Extensions, it launches without problems! But, I wasn't fast enough to prevent it from auto-updating to v35, and as soon as that happened and it restarted, it crashed again!

    I reinstalled it again, but disconnected the network cable so it could not auto-update, and once installed, set it to NOT update. Since then, running version 34.0.5, it works fine.

    Just wondering if anyone else has encountered it, and if they found any way to fix it (apart from installing an older version).

    Also, installed v36 Beta 1 just to see if that was better, and it crashed the same way.

      My System SpecsSystem Spec

  2. #2


    San Jose - California
    Posts : 2,847
    8.1x64PWMC Ubuntu14.04x64 MintMate17x64


    I am currently running 35 without any problem. Are you running any anti virus software ? if yes, temporarily disable it to see if it helps.
    In addition, when uninstalling Firefox. Did you delete ?:
    1. C:\Users\<username>\AppData\Local\Mozilla\Firefox
    2. C:\Users\<username>\AppData\Local\Mozilla\updates
    3. C:\Users\<username>\AppData\Local\VirtualStore\Program Files\Mozilla Firefox (if found)
    4. also delete from registry: HKEY_LOCAL_MACHINE\SOFTWARE\Mozilla


    NOTE: If you delete the above, your bookmarks will be deleted also so before doing the above. Setup Sync from the tool menu first
    then you can sync back everything including the add-ons.
      My System SpecsSystem Spec

  3. #3


    Are you running any anti virus software ? if yes, temporarily disable it to see if it helps.
    All I'm running is Windows Defender -- and the problem is not with installation, it's with the newer versions.

    I don't want to have WD disabled just to run FireFox, especially since version 34 (and prior) work without problems.

    Also, thanks for the locations to check. I'll save off everything first (using Mozbackup, since I'm NOT going to save my accounts and passwords online), clean out those locations and then, reinstall the new version. But, I suspect it's not going to make any difference.
      My System SpecsSystem Spec

  4. #4


    San Jose - California
    Posts : 2,847
    8.1x64PWMC Ubuntu14.04x64 MintMate17x64


    Quote Originally Posted by Mark Phelps View Post
    Are you running any anti virus software ? if yes, temporarily disable it to see if it helps.
    All I'm running is Windows Defender -- and the problem is not with installation, it's with the newer versions.

    I don't want to have WD disabled just to run FireFox, especially since version 34 (and prior) work without problems.

    Also, thanks for the locations to check. I'll save off everything first (using Mozbackup, since I'm NOT going to save my accounts and passwords online), clean out those locations and then, reinstall the new version. But, I suspect it's not going to make any difference.
    WD is fine, I am also running WD. I meant any third party anti virus.
    Another place to check is some startup software/Services might be in conflict.
      My System SpecsSystem Spec

  5. #5


    OK -- uninstalled FireFox, removed all the folders you mentioned, and deleted entries from the registry.

    Reinstalled using v35 -- crashed immediately upon starting -- just like before, even though I have all add-ons and extensions disabled.

    Uninstalled that, reinstalled v34.05 -- works fine -- just like before.

    Guess I should try safe mode -- but that will have to wait until I have time to experiment on this.
      My System SpecsSystem Spec

  6. #6


    UPDATE: I completely removed Firefox -- all files, folders, and settings, rebooted, and reinstalled v35 from scratch.

    Restarted it and -- boom -- crashed right away.

    Restarted it in Safe mode -- boom -- crashed right away.

    Restarted it using the option to disable all add-ons -- started, but took a really long time.

    I went to the trouble to disable, manually, all the add-ons, and I had no extensions or themes installed. But still, when I restarted using Safe mode, it crashed right away -- again!

    So, I did an image restore back to when I was running 34.0.5 -- using loads of add-ons, extensions, and themes -- and just like before, it worked fine every time!

    Found a 64-bit version is know as WaterFox. Downloaded and installed it -- and it automatically imported stuff from FireFox. It seems to be working a lot faster and, unlike the latest FireFox, does NOT crash!

    UPDATE: Checking other forums, discovered that the "hardware acceleration" feature conflicts with WindowBlinds -- which I am using. So, disabled WB, reinstalled FF 35, used Options to turn off hardware acceleration, re-enabled WB -- and FF 35 works fine now.

    Posting this so others will know about this conflict -- and how to resolve it if they are using WindowBlinds.
    Last edited by Mark Phelps; 17 Jan 2015 at 17:08.
      My System SpecsSystem Spec

  7. #7


    Posts : 3
    Window 8, 64-Bit


    @Mark: Thanks for all your posts. I'm not using WindowBlinds and have a crashing FF 35.

    I have disabled hardware acceleration but no joy.

    Finally had to use the "Never Activate" option on Shockwave Flash 16.0.0.257 add-on. It's been hours and FF 35 seems to be working.
      My System SpecsSystem Spec

  8. #8


    Covington, La
    Posts : 1,184
    Windows 7 HP 64bit, Windows 8.1 Pro w/Media Center 64BIT


    I was having trouble with FF 35 and Flash 16.0.0.257 also. FF would hang and not respond. Disabled Flash an works great. I went to FF website and used the Refresh Firefox tool and it now works great and seems faster. Had to re-enable most add-ons and re-install a couple.
    Went through options and changed a few that I wanted and all is working fine now.
    Click on Refresh Firefox button at this site:

    https://www.mozilla.org/en-US/firefox/new/

    Jim
      My System SpecsSystem Spec

  9. #9


    Covington, La
    Posts : 1,184
    Windows 7 HP 64bit, Windows 8.1 Pro w/Media Center 64BIT


    My FF problems came back so I downloaded Flash Beta 16.0.0.280 and seems to be OK for now, but time will tell.

    Jim
      My System SpecsSystem Spec

  10. #10


    Posts : 3
    Window 8, 64-Bit


    As of this writing, it's been 4 days and no problems since I deactivated Flash in FF 35. Really haven't missed it.

    There were a couple of news articles that required Flash, but I just copied the URL and ran it on Chrome.
      My System SpecsSystem Spec

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