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ewok said

any banking or business site that verifies for robots Firefox shows "ERROR for site owner: Invalid site key"

I did an uninstall of Firefox and re-installed. All seems in order now. Had to do 3 re-installs to get there though!!!

Give t a few days. If the problem is gone,

Please flag your last post as Solved Problem so others will know.

You can check for problems with preferences.

• delete possible user.js and numbered prefs-##.js files and rename/remove the prefs.js file to reset all prefs to the default value including prefs set via user.js and prefs that are no longer supported in current Firefox releases
• http://kb.mozillazine.org/preferences_not_saved
• http://kb.mozillazine.org/resetting_preferences

You can open the about:config page via the location/address bar. You can accept the warning and click "I accept the risk!" to continue.

• http://kb.mozillazine.org/about:config

Had to re-install twice before the issue cleared.