Hi, I want to port my extension to web-extensions but i can’t find a way to add a drop-marker on the side of an addon button like a lot of the old,and not so old, extensions do
ie: Pick & Save Images, greasemonkey, stylish or my own:
https://addons.mozilla.org/en-US/firefox/addon/multiple-highlighter/
Is there a way to do this using web-extensions?