Like, but in recent Firefox updates, Join Window is missing Rated 3 out of 5 stars

I have used this add-on for years, but since the update from Firefox 3 to the higher numbers (including my current version of 9), but the Join to window option is gone. This is one of the features in Tab to Window that I used the most, and I miss it greatly. Would rate a 5 if Join to Window still worked.