Download the extension from the latest release.
Chrome and Edge
Download the chrome ZIP from the release (not the GitHub source archive), unzip it, and open chrome://extensions or edge://extensions.
Turn on Developer mode, choose Load unpacked, and select the unzipped folder
containing manifest.json.
Firefox 154+
Download the firefox ZIP from the release, unzip it, and open about:debugging#/runtime/this-firefox. Choose Load Temporary Add-on and select manifest.json.
Unsigned temporary installations are removed when Firefox restarts.
Open the article you want to cite, then click the Card Cutter toolbar icon. The popup
can be expanded into a new tab.