When visiting a new lemmy instance to find communities, you have to copy the !community@server
link from the description to your instance’s search bar. If a chrome/firefox extension could detect that a lemmy instance is loaded and automatically add “Subscribe on [homeinstance.url]” buttons where the normal subscribe button would be, I think it’d go a long way toward making the “Fediverse” easy for new users. Apologies if this exists and I just couldn’t find it.
Is this close to what you are looking for: https://lemmy.world/post/141225
I actually ended up making my own and posted it an hour before that! I got some help making mine work for chrome and firefox. I haven’t gotten it up on either web store yet, but you can check it out here: https://lemmy.world/post/140471