Stay suddenly installing Dark Reader?!

[ppixiv]

Suddenly, "Dark Reader" is running in my browser, which is an extension I don't have installed. It is a horrible, invasive extension that makes weird changes to webpages and breaks them. It even breaks my own userscript (which is how I found out about it). I have a check in my script for it because people thought my script that was broken, when it was Dark Reader's fault. And suddenly I'm seeing my own warning...

After investigating, I found that Stay is silently installing it. A userscript manager should run the scripts the user tells it to, not just random things! And people won't even know why weird things are happening, since Stay installs it silently without even asking permission.