CoW is made for Chromium-based browsers
Install CoW from the Chrome Web Store in Chrome, Microsoft Edge, Brave, Opera, Vivaldi, Arc, and other Chromium-based browsers.
Some browsers restrict extensions by default
Privacy-focused, managed, work, or school browsers can disable extensions or block Chrome Web Store installations. Check that extensions and the Chrome Web Store are allowed in that browser's settings, or ask your administrator if the browser is managed.