Increase spacing between entries in Firefox drop-down menu bar?

I'm running Firefox Quantum, 64.0.2 on Windows.

I would like to increase the spacing between the entries in the drop down menus underneath File/Edit/History/Bookmarks/Tools/Help on Firefox. The entries all look too bunched together to me.

I've looked around Firefox/Mozilla message boards and found a few similar requests from over the last few years, but haven't had any success trying the posted CSS suggestions. I tired the addon Theme Font and Size Changer ( but it no longer seems to work.

I'd love to have a new CSS written, one that I could easily tweak, but am unable to write it myself.

Is there someone who may be able to help?




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