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I don't think so. I use Sidebery and their recommended approach is to edit userChrome.css. It's not too bad and works well. See https://github.com/mbnuqw/sidebe

by velut 3y ago

I don't think so. I use Sidebery and their recommended approach is to edit userChrome.css. It's not too bad and works well. See https://github.com/mbnuqw/sidebery/wiki/Firefox-Styles-Snippets-(via-userChrome.css) https://github.com/mbnuqw/sidebery/wiki/Firefox-Styles-Snipp....