When I click on the firefox icon I get "non responding" and a blank page. Have uninstalled and reinstalled firefox twice using windows 7
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Can you check it in safe mode? start Firefox in Safe Mode by holding down the shift key while starting Firefox and select Start in Safe Mode.
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.
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 internet for Firefox and the plugin-container process and the updater process.
It opens in safe mode. Deleted all the rules from permissions list. Did not see plug in container. Using Norton Security suite via comcast. I disabled the antivirus program and firewall....still not responding. Also before this lastest problem I would also get "firefox already open" problem when clicking on the icon.
If it does work in Firefox Safe-mode then disable all extensions (Tools > Add-ons > Extensions) and then try to find which is causing it by enabling one extension at a time until the problem reappears.
Close and restart Firefox after each change via "File > Exit" (Mac: "Firefox > Quit"; Linux: "File > Quit")
Try to disable hardware acceleration in Firefox.
In Safe mode the extensions are disabled already. When I enable one at a time it is still non-responsive. By the way I don't see where tools is an option. I hit the add-on tab to get to the extensions.