The idea is that you can set up "tag groups", where once you add the first tag, the other tags are automatically added. I've only tested it in Firefox and Chrome but theoretically it should be pretty easy to get it to work in other browsers.

Source code here: https://github.com/a-e-m/cohost-tag-groups

Guide

You can set up tag groups by going into the options for the extension (exact way to get there depends on browser, but typically opening the general settings page for extensions is a good start)

If the extension is installed and you've added tags but they're not showing up on Cohost, you may need to refresh the page having issues