Google Calendar links to ICS – Get this Extension for 🦊 Firefox (en-US)
addons.mozilla.org
Download Google Calendar links to ICS for Firefox. An add-on that intercepts links that create new Google Calendar events and turns them into iCalendar (ICS) files you can import in your favorite calendar application (Thunderbird, Outlook, Proton Calendar, etc.)

Here’s my Christmas gift for the community: a Firefox add-on that transforms links to create new Google Calendar events into ICS files you can import in your favorite calendar application.