One download, two one-time setup steps, then it opens on its own forever. Takes about a minute.
Open the downloaded Anti-Glaze.dmg and drag the Anti-Glaze icon onto the Applications folder. Then eject the disk image.
Open Anti-Glaze from Applications. It asks for two macOS permissions on first run:
After enabling each one, quit Anti-Glaze completely (⌘Q) and reopen it — macOS only applies a new permission to a freshly launched app. You only do this once.
Anti-Glaze registers itself to launch automatically every time you log in — protection is on before your browser is. You don't need to do anything for this; it's set up on first run.
Want to disable it? Open Anti-Glaze → click the gear icon in the dashboard → Settings → General → toggle Open at login off. You can flip it back on from the same place.
Everything runs on your machine. Nothing about your screen ever leaves your computer. Requires macOS 12 or later.