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Thank you!

thx for your reply, but have found the ff-button. it was at the bottom of the tab-bar, in the corner.

sorry, overlooked it completely. with it, everything is under control again..

btw: is there a way to edit/modify your forum-post after posting??

There is a "Edit this post" button to the left of your post.

I have 3 desktops with a total of 5 windows, all started from the first window on the first desktop. as it happens I removed the menu-bar from the single window on the 3th desktop. as it turns out, this is the ONLY window that has the ff-button. if I restore the menu-bar, this is the ONLY window that gets the bar back.

all other windows on the 1st and 2nd desktop remain unchanged: no ff-button, no menu-bar.

luckily I discoverdred that pressing [ALT-F] momentarily brings back the menu so an option can be selected. but then the menu-bar disappears again.

is this normal behaviour?

Im not sure, lemme see.