keep in mind those selectors definitely won't work in your regular userChrome sheet though. comes in pretty handy for other stuff too though. actually you can see one of the main things I used it for was handling those places popups without messing up other menulists. I have some examples on github, see the readme regarding the setup. since it's in a shadow tree it's kinda unavoidable if you're limited to just user sheets, but if you make an author sheet, you can use a selector like #BMB_bookmarksPopup menupopup::part(arrowscrollbox) or #BMB_bookmarksPopup menupopup::part(arrowscrollbox-scrollbox) they've been updated to use the arrowscrollbox custom element. that selector is gonna affect a huge number of popups throughout the browser, and actually will affect all menupopups once you get the proton update.
Nice idea, you might wanna look at some other popup menus to check for collateral damage though.
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