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Firefox 40.3 will not start but older versions will

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Firefox 40.0.3 will not start or open. I Uninstaller and put on 36.0.3 and it runs. Once I go to the About tab it automatically downloads the latest version. Then when I click on the Firefox icons nothing happens. I have repeated this process several times with the same results. XP Pro SP3

Firefox 40.0.3 will not start or open. I Uninstaller and put on 36.0.3 and it runs. Once I go to the About tab it automatically downloads the latest version. Then when I click on the Firefox icons nothing happens. I have repeated this process several times with the same results. XP Pro SP3

Chosen solution

Did you try Firefox Safe Mode with normal computer?

In that case, one of the other programs on your system is causing the problem. Look at the list of programs on your system. Anything look odd?

Windows: Start > Control Panel > Uninstall Programs. Mac: Open the "Applications" folder. Linux: Check your user manual.

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Additional System Details

Application

  • User Agent: Mozilla/5.0 (Linux; Android 5.0.1; SAMSUNG SM-N910V 4G Build/LRX22C) AppleWebKit/537.36 (KHTML, like Gecko) SamsungBrowser/2.1 Chrome/34.0.1847.76 Mobile Safari/537.36

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FredMcD
  • Top 10 Contributor
4305 solutions 60410 answers

Helpful Reply

Start Firefox in Safe Mode {web Link} by holding down the <Shift>
(Mac Options)
key, and then starting Firefox. Is the problem still there?


Start your Computer in safe mode with networking. Then start Firefox. Try Safe web sites. Is the problem still there?

Starting The Computer In Safe Mode;
Free Online Encyclopedia

Start '''[https://support.mozilla.org/en-US/kb/troubleshoot-firefox-issues-using-safe-mode Firefox in Safe Mode]''' {web Link} by holding down the '''<Shift><br> ''(Mac Options)'' ''' key, and then starting Firefox. Is the problem still there? ----------------- Start your '''Computer''' in safe mode with networking. Then start Firefox. Try '''Safe''' web sites. Is the problem still there? '''[http://encyclopedia2.thefreedictionary.com/Linux+Safe+Mode Starting The Computer In Safe Mode;<br>Free Online Encyclopedia]'''

Question owner

I rebooted windows in Safe Mode with networking, it started OK and was able to go to a few websites. What should I do next?

I rebooted windows in Safe Mode with networking, it started OK and was able to go to a few websites. What should I do next?

Question owner

Ok this worked, what do I do next?

Ok this worked, what do I do next?
FredMcD
  • Top 10 Contributor
4305 solutions 60410 answers

Chosen Solution

Did you try Firefox Safe Mode with normal computer?

In that case, one of the other programs on your system is causing the problem. Look at the list of programs on your system. Anything look odd?

Windows: Start > Control Panel > Uninstall Programs. Mac: Open the "Applications" folder. Linux: Check your user manual.

Did you try Firefox Safe Mode with normal computer? In that case, one of the other programs on your system is causing the problem. Look at the list of programs on your system. Anything look odd? '''Windows:''' Start > Control Panel > Uninstall Programs. '''Mac:''' Open the "Applications" folder. '''Linux:''' Check your user manual.
cor-el
  • Top 10 Contributor
  • Moderator
17670 solutions 159854 answers

It is possible that your firewall or other security software 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:

It is possible that your firewall or other security software 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: *https://support.mozilla.org/kb/Server+not+found *https://support.mozilla.org/kb/Firewalls *https://support.mozilla.org/kb/fix-problems-connecting-websites-after-updating