Since -moz-appearance: checkbox; takes care of the styling, except for the min-width/height, we can remove the fallback styling. Here's the code to remove: - https://searchfox.org/mozilla-central/rev/fd32b3a6fa3eff1468311f6fcf32b45c117136df/browser/themes/osx/places/editBookmark.css#59,62,64-67 - toolkit/themes/osx/global/checkbox/cbox-check.gif can be removed as well - https://searchfox.org/mozilla-central/rev/fd32b3a6fa3eff1468311f6fcf32b45c117136df/toolkit/themes/osx/global/jar.mn#49 You'll also need to replace https://searchfox.org/mozilla-central/source/accessible/tests/mochitest/treeview.css#2 with url("chrome://global/skin/icons/check.svg")

Hi Tim, I'd like to take this up and work on it.

Assigned it to you, please let me know if you have any questions!

Hi Tim. I've made the necessary changes. Please let me know if anything else needs to be changed. Thanks!

Pushed by dgottwald@mozilla.com: https://hg.mozilla.org/integration/autoland/rev/53ebd07fd26e Remove macOS fallback styling for the bookmarking panel tag selector checkboxes r=dao