Black screen flashes before opening gmail

Hi, recently I updated to Firefox 4.0. Since then, every time I visit gmail.com a black screen appears. After a split second it disappears again and the usual gmail log in screen shows up. Why is that and how can I get rid of that black screen flashing before gmail loads? Has it something to do with the ad-ons adblock, flashblock and noscript I installed? They never caused any trouble in Firefox 3.x

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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