It is very useful addon. Thanks for your efforts. I am using it on debian linux, Firefox 60.4.0esr. After the latest update it won't work anymore. Nothing happens when i click at toolbar icon or select page context menu item.

16-01-2018: Still not working on debian linux, Firefox 60.4.0esr. How can i privide additional info to help you? May be i can look something in code inspector?
Get back to Version 1.0.2, working pretty fine.

Works great with my window manager, saves me a lot of space when having multiple windows open.

Works perfectly, thank you.