Safari Extension
Any chance of a safari extension?
Hey João, I just remembered that Safari supports website notifications. Wouldn't that work for Join? The notification would not come from an extension, of course, but it could come from the website https://joinjoaomgcd.appspot.com/. So Safari users could receive all pushes and they would just need to access the website to send things. It's not a perfect solution, but I think it is a reasonable workaround... No extension involved.
Of course, you would have to evaluate if it is worth it to pursue this.
Please, consider this.
Chrome is a battery hog on Mac, and I haven't moved to Safari yet only because of Join. All my other extensions work on Safari.