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.

ابحث في الدعم

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

Firefox will no longer work after uninstalling and reinstalling

  • 6 ردود
  • 0 have this problem
  • 1 view
  • آخر ردّ كتبه Morbus

more options

I am running max osx 10.6.3 and when i closed firefox i couldnt reopen it unless i force quit the app or quit it completely before closing the browser so i uninstalled and then reinstalled but the problem persisted so I deleted the contents of the preference folder after installing then reinstalled but now everytime i try to open it it gives me an error saying "a copy of firefox is already open. only one cope of firefox can be open at a time". I restarted the computer several times but that didnt fix anything and i can no longer start firefox. I am assuming its because there is a file somewhere telling firefox that it is open but I can find it.

This happened

Every time Firefox opened

I reinstalled firefox

User Agent

Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10_6_3; en-us) AppleWebKit/531.22.7 (KHTML, like Gecko) Version/4.0.5 Safari/531.22.7

I am running max osx 10.6.3 and when i closed firefox i couldnt reopen it unless i force quit the app or quit it completely before closing the browser so i uninstalled and then reinstalled but the problem persisted so I deleted the contents of the preference folder after installing then reinstalled but now everytime i try to open it it gives me an error saying "a copy of firefox is already open. only one cope of firefox can be open at a time". I restarted the computer several times but that didnt fix anything and i can no longer start firefox. I am assuming its because there is a file somewhere telling firefox that it is open but I can find it. == This happened == Every time Firefox opened == I reinstalled firefox == == User Agent == Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10_6_3; en-us) AppleWebKit/531.22.7 (KHTML, like Gecko) Version/4.0.5 Safari/531.22.7

All Replies (6)

more options

Hello Al.

You may be having a problem with some extension or plugin that is hindering your Firefox's normal behavior. Have you tried disabling all add-ons (just to check), to see if Firefox goes back to normal?

more options

I cant really get into firefox to disable or uninstall them and while an extension may have been causing my original problem, it isnt anymore. Now its a problem with the firefox system files but I guess I may be wrong.

more options

p.s. the last post was from me, forgot to put my name in

more options

Finally found the culprit folder. Something in the mozilla folder under ~/library/application support was causing the problem... deleted it, uninstalled and then reinstalled and we r back in the game.

more options

To manage extensions when you can even open Firefox, use safe mode.

It's great that it's fixed, though.

more options

Forgot all about safe mode... I guess I didnt c the Icon for it like you have on a PC so didnt think to use it. Oh well, thanks for the help anyways