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Program Design

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You still haven't reduced the spacing between the menu items!

This still affects the overview and readability. Many users have complained about this, but you have not reacted. This is user-unfriendly.

You still haven't reduced the spacing between the menu items! This still affects the overview and readability. Many users have complained about this, but you have not reacted. This is user-unfriendly.

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It's quite possible to do it yourself.

Open about:config and set toolkit.legacyUserProfileCustomizations.stylesheets to true.

Now go to about:support. Look down the blue block on the left of the screen that will open until you come to "Profile Directory". Click the "Open Directory" button next to it. This will open your Profile Directory in Windows Explorer, or whatever file browser your system uses.

Make a directory/folder in that called chrome, all lower case. Get into that and create a text file called userChrome.css (all lower case apart from the C in the middle) with this inside it:— /* Reduce space between entries on pop-up menus */ .toolbar-menupopup :is(menu, menuitem), .subviewbutton {
  padding: 4px !important;
}
Make sure it has saved as userChrome.css and not userChrome.css.txt. In Windows you can right-click it and open Properties to see its full name. Correct it if needed.

Restart Firefox for it to take effect.

The 4px can be further reduced, including to zero, to close the gaps even more.