Why does Firefox no longer launch when I double-click the icon?

I found an article on the support site that suggested creating a new profile, but the run command did not launch profile manager. I tried uninstall/reinstall, but it does not change behavior. When I click the icon, I get the hourglass for a moment, and then nothing. I'm on WinXP. On 10-14-11, I thought I saw a pop-up menu saying Firefox was updating (I did not initiate it, nor was I presented with a confirm pop-up), but it was very brief, so I'm not sure. After that day, Firefox would no longer launch. I've not made any system changes, or installed any programs.

See:
*http://kb.mozillazine.org/Browser_will_not_start_up
Start Firefox in <u>[[Safe Mode]]</u> to check if one of the extensions is causing the problem (switch to the DEFAULT theme: Firefox (Tools) > Add-ons > Appearance/Themes).
*Don't make any changes on the Safe mode start window.
*https://support.mozilla.com/kb/Safe+Mode
A possible cause is security software (firewall) that 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 from the permissions list in the firewall and let your firewall ask again for permission to get full unrestricted access to internet for Firefox and the plugin-container process and the updater process.
See:
* https://support.mozilla.com/kb/Server+not+found
* https://support.mozilla.com/kb/Firewalls

Similar Messages

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    **Running Windows Vista 6.0 SP1 with Firefox 6.0.2

    See:
    *http://kb.mozillazine.org/Browser_will_not_start_up
    Start Firefox in <u>[[Safe Mode]]</u> to check if one of the extensions is causing the problem (switch to the DEFAULT theme: Firefox (Tools) > Add-ons > Appearance/Themes).
    *Don't make any changes on the Safe mode start window.
    *https://support.mozilla.com/kb/Safe+Mode
    A possible cause is security software (firewall) that 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 from the permissions list in the firewall and let your firewall ask again for permission to get full unrestricted access to internet for Firefox and the plugin-container process and the updater process.
    See:
    * https://support.mozilla.com/kb/Server+not+found
    * https://support.mozilla.com/kb/Firewalls

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    See also:
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    A possible cause is security software (firewall,anti-virus) that blocks or restricts Firefox or the plugin-container process without informing you, possibly after detecting changes (update) to the Firefox program.
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    See:
    *https://support.mozilla.org/kb/Server+not+found
    *https://support.mozilla.org/kb/Firewalls
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