|User since||April 10, 2016|
|Number of add-ons developed||0 add-ons|
|Average rating of developer's add-ons||Not yet rated|
Rated 5 out of 5 stars
This is the extension I miss the most on Firefox 57. The only one I've found that even attempts it is https://addons.mozilla.org/en-US/firefox/addon/otherwindow/, but it is a poor substitute. Anyone find any thing else that works as good as Window Master?