Firefox will not start, have exhausted all published fixes

User Help for Mozilla Firefox
Posts: 17
Joined: October 13th, 2017, 11:00 am
Location: Mountainside in Western North Carolina

Post Posted October 19th, 2017, 8:03 am

Thanks Allande, but I disabled Avast and Firefox wouldn't start. I've reverted profiles.ini back to the original file with no results. And I've not been able to start the Profile Manager as Firefox won't start at all. Unfortunately, I do use Thunderbird.

Posts: 188
Joined: July 20th, 2017, 11:58 am

Post Posted October 19th, 2017, 8:38 am

You can still try Firefox Portable 52 ESR.
Or, create a new windows user, and in that user account install Firefox and see if it starts. A separate user account will not affect your main Firefox user data.
Login as administrator, or if your account has admin already you can just follow the steps: ... indows-10/ Then signout and sign in to the new user and install Firefox.


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Posts: 485
Joined: April 15th, 2017, 10:25 am
Location: Never-Never-Land

Post Posted October 20th, 2017, 11:27 am

@ eldubya :

This may not apply to you at all, but I felt I should mention it anyway, just in case :

Somebody on the Mozilla support forum, who had the exact same problem, just posted this :

"took down my Logitech Webcam Pro 9000 - physically and all the installed software.

After the usual re-boot of Windows AND re-installing Firefox - BINGO! "


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Posts: 19194
Joined: March 10th, 2004, 9:59 pm
Location: Maryland USA

Post Posted October 24th, 2017, 11:06 am

Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US; rv: Gecko/20110420 SeaMonkey/2.0.14 Pinball CopyURL+ FetchTextURL FlashGot NoScript

Posts: 3894
Joined: March 19th, 2005, 10:51 am

Post Posted October 24th, 2017, 11:27 am

56.0.2 is on the road map.

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