BetterTouchTool (which isn’t free but is worth every penny) lets you do everything rectangle does. Also lets you configure your mouse buttons to do whatever you want. Also infinite custom hot keys and shortcuts.
Also Raycast as a replacement for Spotlight.
Just came here to say that this also affects any applications that use the libwebp library.
That includes many apps that most people don’t think of as “browsers”.
Electron based applications all use chromium under the hood, and are quite common/prolific these days.
https://www.electronjs.org/apps
Expect updates to a lot of things in the near future.