Neat project, people have wildly differing browser workflows and it's interesting to get a glimpse of how the brain of this extension's author deals with the concept.
?? Firefox has an API for a Sidebar and yet they make it such a pain to actually switch to one.
I hear so many complaints about Mozilla for politics, etc, but my real complaint is that they haven't added a Vertical tabs option (which really should be the default on all browsers).
This might benefit from using Firefox's Sidebar API: https://developer.mozilla.org/en-US/docs/Mozilla/Add-ons/Web...