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.

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

Firefox won't start, even after uninstal and reinstal

  • 2 replies
  • 2 have this problem
  • 1 view
  • Last reply by Makoussai

more options

I was using Firefox normally. I closed it for a while then I would never open again. I uninstalled and reinstalled it and it did not fix the problem. I deleted the program folders and profile folders and reinstalled again... same thing. When I launch it, the spinning cursor works for a while then goes back to the arrow shape. I have no more details to give.

I was using Firefox normally. I closed it for a while then I would never open again. I uninstalled and reinstalled it and it did not fix the problem. I deleted the program folders and profile folders and reinstalled again... same thing. When I launch it, the spinning cursor works for a while then goes back to the arrow shape. I have no more details to give.

Chosen solution

Thanks to Cor-el who put me in the good direction. My problem was not with any security system, but with a software that was installed without my consent in my computer. I found it by going through all apps in the programs and settings window. The culprit is "Interenet optimizer" (named exactly as this). After uninstalling this guy my Firefox started without any glitch.

Read this answer in context 👍 0

All Replies (2)

more options

It is possible that your security software (firewall, anti-virus) blocks or restricts Firefox or the plugin-container process without informing you, possibly after detecting changes (update) to the Firefox program.

Remove all rules for Firefox and the plugin-container from the permissions list in the firewall and let your firewall ask again for permission to get full, unrestricted, access to install for Firefox and the plugin-container process and the updater process.

See:

more options

Chosen Solution

Thanks to Cor-el who put me in the good direction. My problem was not with any security system, but with a software that was installed without my consent in my computer. I found it by going through all apps in the programs and settings window. The culprit is "Interenet optimizer" (named exactly as this). After uninstalling this guy my Firefox started without any glitch.