Firefox very slow: how to make it faster?

[RobertJ]

So finally one could say, my Firefox runs like it should run, obviously.

Probably but you might have other issues on your system such as that scanning mentioned in a previous post. Not familiar with WIN but that scanning definitely sounds like something is wrong.

Cheers

.

[Dirki]

Yes, that scannig appears to be very wrong.

Thank you very much!