Download and unzip the package
Download the ZIP above, then double-click it. Keep the resulting cookieglide-extension folder somewhere you will not delete.
Open the extensions page
In Chrome, enter chrome://extensions in the address bar. In Edge, use edge://extensions. Turn on Developer mode in the upper-right corner.
Load and pin CookieGlide
Select Load unpacked and choose the unzipped folder. Use the puzzle icon in your browser toolbar to pin CookieGlide, then open any normal website and click the CookieGlide icon.