[geza]

I tried porting the extension over to Firefox when Firefox switched to WebExtensions, and at the time there were tons of incompatibilities, mostly with Firefox's Shadow DOM implementation (HabitLab is a huge and complicated codebase, porting it is non-trivial - I had an issue tracking it at https://github.com/habitlab/habitlab/issues/137 ). I'm sure it's a valid option for smaller extensions however. At the moment I'm trying to get it accepted on the Edge store, as Edge is much more compatible with Chrome extensions than Firefox.

[jacamera]

Have you tried again with Firefox recently? I'm the developer of an extension that makes extensive use of the Shadow DOM for UI components in content scripts. I recently ported our Chrome-only extension over to Firefox and had a few minor issues but none with the UI. I'm even using React for Shadow DOM UI components and it's been working well in both browsers.

[hanklazard]

I wonder if others are thinking the same re: Edge and whether this will eventually lead to chrome losing users to Edge as useful extensions find a home there.