I updated firefox 3.6.10 to 3.6.11 and rebooted... when back connected in firefox does not start and gives an error saying 1.9.10 aren't compatible wth 1.9.11

This is the full error message
"Error: platform version ' ' is not compatible with
minVersion > =
maxVersion < =

Do a clean reinstall and download a new copy of Firefox since http://www.mozilla.com/firefox/all.html and save the file to the desktop.

Uninstall your current version of Firefox and remove the Firefox program folder before installing this copy of the Firefox installer.

Do not remove personal data during the uninstallation.

It is important to remove the Firefox program folder to delete all the files and make sure that there is no problem with the files that were the remains after uninstallation.

You can skip the step to create a new profile, which is not required on this issue.

See http://kb.mozillazine.org/Standard_diagnostic_-_Firefox#Clean_reinstall

Tags: Firefox

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