@Lando iceshrimp is a fork of firefish with a lot of performance fixes and some things refactored on the back end that will allow it to scale. It also fixes some bugs with firefish, like translation, some aspects of the mastodon api compatibility (makes mastodon mobile apps work more seamlessly), and perhaps most importantly, it has a vibrant development community rallying around it. Firefish, while not dead, has not been moving fast on fixing known issues or implementing new features.
There is an issue in Settings -> Drive. If I upload an image and later delete it, the used data, shown in Settings -> Drive, includes the size of the deleted image.
@srijit I was not aware of it. I'll take a look at it. So far, I've been very pleased with the speed of improvements and the willingness to help me out from the iceshrimp team.