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ps: I was thinking... could it be possibly an incompatibility with other add-ons I have installed in firefox? for example with another web-security add-on such as "NoScript Security Suite"? anything known about that?
yes, I've done all that.
exept for step 6, that couldn't be completed, because after restarting firefox there simply seems to be NO F-secure add-on added to the Add-on page that could be "allowed for installation"…