User Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.14; rv:83.0) Gecko/20100101 Firefox/83.0

Steps to reproduce:

Tried to delete a bookmark.

Actual results:

The contextual menu started strobing.

Expected results:

A user's position in the menu should be clear, and the menu should not start strobing.

I am using my own css to replace the standard fonts with more readable fonts in larger sizes. Also some add-ons to try to stop strobing and some other animation.

Relevant userChrome.css:

/* Global UI font */

• { font-family: Andika !important; }
• { font-size: 16pt !important; }
  #urlbar { height: 20pt }

/* Bookmarks spacing */
#placeContent treechildren::-moz-tree-row {
min-height: 24pt !important;
max-height: 24pt !important;
}

Bugbug thinks this bug should belong to this component, but please revert this change in case of error.