Hello, I apologize for the delayed response to this question.

At this time, the best way to accomplish this is to create two containers - one for each google docs account - and then use the "Set Default URL" feature, which will allow you to click the container and it will immediately open the URL that you wanted to bookmark.

This method will require you to open the Containers Helper popup and then click on the container in the popup's container list. You can do this via the default keyboard shortcut alt+shift+D (cmd+shift+D on Mac) and start typing to filter on your container's name, then press the Enter key to open the top search result. This will be just as fast as clicking on a bookmark, once you get used to it.

I hope this helps. Have a great day. If you have further questions, visit https://codeberg.org/firefox-containers-helper/firefox-containers-helper and create an issue, I will respond there.