Rated 4 out of 5 stars

There is some development going on (at long last).
It seems that now new windows are created instead of the previous sub-windows. Thus creating multiple entries to Windows taskbar. And a lot of jumping windows when you dare to move the "split" or create a new split.
And the created splits are still not saved when Firefox is exited ...

This user has 3 previous reviews of this add-on.