This site will have limited functionality while we undergo maintenance to improve your experience. If an article doesn't solve your issue and you want to ask a question, we have our support community waiting to help you at @FirefoxSupport on Twitter and/r/firefox on Reddit.

Avatar for Username

Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More

This thread was archived. Please ask a new question if you need help.

Firefox won't open/start on Vista OS. No changes & no new updates

  • 2 replies
  • 37 have this problem
  • 16 views
  • Last reply by dsheph501

AnonymousUser
AnonymousUser
more options

Firefox message said "running. close all firefox windows". Firefox window did not appear to be open so I shut down puter and rebooted. Firefox will not load, open, connect. Nothing. I've even gone into the computer file to click on firefox.exe file. Nothing, zip, nada

this evening

User Agent

Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.0; Trident/4.0; GTB6.4; Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1) ; SLCC1; .NET CLR 2.0.50727; Media Center PC 5.0; .NET CLR 1.1.4322; InfoPath.1; .NET CLR 3.5.30729; .NET CLR 3.0.30729)

Firefox message said "running. close all firefox windows". Firefox window did not appear to be open so I shut down puter and rebooted. Firefox will not load, open, connect. Nothing. I've even gone into the computer file to click on firefox.exe file. Nothing, zip, nada == this evening == == User Agent == Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.0; Trident/4.0; GTB6.4; Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1) ; SLCC1; .NET CLR 2.0.50727; Media Center PC 5.0; .NET CLR 1.1.4322; InfoPath.1; .NET CLR 3.5.30729; .NET CLR 3.0.30729)

Chosen solution

See http://kb.mozillazine.org/Browser_will_not_start_up --- You can do a clean reinstall and download a fresh Firefox copy from http://www.mozilla.com/firefox/all.html and save the file to the desktop. Uninstall your current Firefox version and remove the Firefox program folder before installing that copy of the Firefox installer. It is important to delete the Firefox program folder to remove all the files and make sure that there are no problems with files that were leftover after uninstalling. You can initially skip the step to create a new profile, that may not necessary for this issue. ..... See http://kb.mozillazine.org/Standard_diagnostic_-_Firefox#Clean_reinstall

See also http://kb.mozillazine.org/Profile_backup and Back up and restore information in Firefox profiles

Read this answer in context 👍 0

All Replies (2)

cor-el
cor-el
  • Moderator
  • Top 10 Contributor
more options

Chosen Solution

See http://kb.mozillazine.org/Browser_will_not_start_up --- You can do a clean reinstall and download a fresh Firefox copy from http://www.mozilla.com/firefox/all.html and save the file to the desktop. Uninstall your current Firefox version and remove the Firefox program folder before installing that copy of the Firefox installer. It is important to delete the Firefox program folder to remove all the files and make sure that there are no problems with files that were leftover after uninstalling. You can initially skip the step to create a new profile, that may not necessary for this issue. ..... See http://kb.mozillazine.org/Standard_diagnostic_-_Firefox#Clean_reinstall

See also http://kb.mozillazine.org/Profile_backup and Back up and restore information in Firefox profiles

dsheph501
dsheph501
more options

This solution really worked for my computer. Thanks for the solution.