Can't open firefox since downloading 5.0

I can open internet explorer; but since downloading firefox 5.0, I can't open it.

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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  • I can't open iTunes since

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  • Operating System Window XP Professional. I can not open Firefox. I have reset it and it worked for a few days. Now I can not execute it. Appreciate help.

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  • Can only open firefox once, have to restart to open more than one browser. can't upload any pictures the box doesn't pop up, my browser settings are diff now

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    * see [[Firefox hangs or is not responding - How to fix#w_firefox-hangs-when-you-quit-it]]_firefox-hangs-when-you-quit-it
    * this explains how to check & if necessary kill the process [["Firefox is already running but is not responding" error message - How to fix it#w_end-firefox-processes]]_end-firefox-processes
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    *see [[Profiles - Where Firefox stores your bookmarks, passwords and other user data]]
    You need to look for the files ''sessionstore.js'' and numbered duplicates of that. Delete them.
    * see http://kb.mozillazine.org/Firefox_hangs#Multiple_sessionstore.js_files

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