Super Grizzly Bear

You can use desktop extensions in mull?

So you can! That’s awesome, thanks. For anyone who wants to know:

You can create a custom addon collection on addons.mozilla.org

Then to add your custom collection in mull (or ff nightly, I guess) enable debug mode by going to settings > about mull and tapping the logo 5 times. Then go back and under the advanced section you can find “custom add-on collection”