This extension works well at a brief glance. You can quickly group & sort your tabs and start switching contexts.

Some caveats:
- When loading a group all tabs load at once instead of just the focused tab. It would be nice if the unfocused tabs appeared but did not load, similar to when Firefox loads tabs from last time on start. I suspect this is a limitation in the current WE APIs.
- if there is a tab you want open all the time, you'll have to pin it.