Hey there!

Please see https://support.mozilla.org/en-US/questions/1342447 for how to remove the double spacing.

Hope I helped!

Kind regards,

Bithiah

No excuse. 100% no excuse.

Hey there!

If your problem is solved, please mark an answer as a solution so that others know this thread is solved. Thank you!

Hope I helped!

Kind regards,

Bithiah

Here is the userChrome.css code that will reduce the spacing of menu lists. Follow the directions that explain how to create and use a userChrome.css file at this link.

https://support.mozilla.org/en-US/questions/1338204

_______________________________________________________________________________________________________________________________

/*** Tighten up drop-down/context/popup menu spacing (8 Sep 2021) ***/

menupopup:not(.in-menulist) > menuitem, menupopup:not(.in-menulist) > menu {

 padding-block: 1px !important; /* reduce to 3px, 2px, 1px or 0px as needed */ 
 min-height: unset !important; /* v92.0 - for padding below 4px */

}

root {

 --arrowpanel-menuitem-padding: 4px 8px !important;

}

Knowledgeable volunteers/contributors should fix this problem for good in upcoming versions !!