Rated 5 out of 5 stars
I clicked on the 'support section' and it took me here, so here I am.
Only issue I have is the button is stuck in the lower right 'legacy addonbar' and I can't move it out. When I enter Customize, I the button shaded, but can't move it elsewhere. My understanding is the add-on doesn't use the "new" toolbar and button APIs (https://blog.mozilla.org/addons/2013/12/12/australis-for-add-on-developers-1/). Otherwise it is a invaluable for anyone with multiple gmail accounts.