Doesn't do anything beyond what the regular + & - function does Rated 2 out of 5 stars

I didn't find not having the add-on bar in 30 a hindrance, I just placed the icons on the bookmarks toolbar. However, it seems to do nothing beyond what my FF zoom in and zoom out does, and in fact, has frozen the percentage shown for that function at 120%, no matter what level of zoom I'm actually using. So, it's doing nothing, AND removing the functionality of seeing how much more or less zoom I'm currently using.