gg, thx

This is a must have if you're running Firefox borderless on Kubuntu or any other Linux distro. Makes the window as slick as in windows 10.

Amazing! It's super helpful when it comes to Firefox Quantum on Linux

Exactly what I was looking for. I use it on Xubuntu (with XFCE). I configured my system so that there is no titlebar in maximized windows. I put the Close button into the tab bar. So I can still close the window with ease.

Adds a Close Window at the TAB BAR so you can close the window when the Hide TITLE Bar is active in the Customized Option

It is very useful under KDE and other window managers systems. Obviously not in Windows or MacOS.

Works great! A must for those of us who hide the titlebar or customize nav / bookmark / tab bar order, allowing us to put the close button wherever we want! The authors' other button addons work great as well!

Feature Request: allow us to pick the button color so we can match our theme colors! =)

Great!

Works great for firefox 57.0 on my debian gnome

Works great!

But, have you ever consider a 4-in-1 addon?

Don't know if it's possible, but an addon that would Hide the TitleBar AND show the 3 buttons would make a lot of sense (specially if we could which of the buttons to show).

Instead of having to install 4 addons we would need just one! =)

It will add the "X" botton to the toolbar. So we will never need tittle bar.

Simple, but useful. Means I can remove window manager's titlebar to save space and just use this extension to click and close Firefox.
Any chance of having an option to place it at the left-hand side instead? (This is where I normally place my window manager controls.)