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Firefox Won't Start

  • 1 reply
  • 1 has this problem
  • Last reply by cor-el

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I recently re-installed Kaspersky on my computer and now Firefox won't open, it was working fine before, there's no error message or anything. I've already been through the articles and nothing has helped, nothing related to firefox will open and uninstalling to re-install has proven to be nothing but a waste of time, does anyone have any suggestions I cannot keep using someone else's computer because of this

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Try to start Firefox in Safe Mode to see if that works.

  • Windows: hold down the Shift key while starting Firefox
  • Mac: hold down the Options key while starting Firefox

It is possible that your firewall or other security software blocks or restricts Firefox without informing you, possibly after detecting changes (update) to the Firefox application. Remove all rules for Firefox from the permissions list in the firewall and let your firewall ask again for permission to get full, unrestricted, access for Firefox and the plugin-container process and the updater process.


Boot the computer in Windows Safe mode with network support to see if that has effect in case security software is causing problems.

For issues with Kaspersky you will have to contact Kaspersky for support.