when you are about to save a file do disc like the picture indicates, you could operate inside that folder with right klick, for example create
a new subfolder throu that way without opening the folder, and right klick to view the files there not the least
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In firefox however that way is completley locked, annoying, i have heard a rumour that it can exist an downloadable "add" or settings that releases this lock?
2. I think Firefox integranted popup stopper doing a hell of a!...bad job
it slips throu about 50 % of the popup in my view, is there some complements?, or hidden settings?, or third party ones who works for Firefox? that will close the holes?

however you(i) must do 2-3 right klick attemps in a white(no object) area inside a folder before "new -" will extend its alternatives, and i can find "create new folder"..cause klicking so 1 time only will not show thoose aternatives , instead "new - new" then you cant get any further
anyhow i guess its solved if i from now on right klick a fiew fast times and dont give up