Convert a tab into a popup window works well. but when I merge popup, the firefox windows missed. I use "Sizer" software to get windows current position, it is outside screen. (my monitor resolution is 2560x1440, but firefox windows position at left:2757 top:83)

It works! Firefox 121.0.1, Arch Linux, i3 WM (X11)

This extension has remember window size, which is awesome! great Work!

Works, but a needs assignable keyboard shortcuts to be truly powerful.

I use a trio of extensions for pop-ups.

Focus Popup https://addons.mozilla.org/addon/focus-popup/ has a keyboard shortcut (Control-Shift-7) and can duplicate a tab into a pop-up (without history) whilst leaving the original (with history).

PopUp https://addons.mozilla.org/addon/popup/ preserves tab history when popping up, and allows me to choose the window in which a pop-up should be restored, but has no keyboard shortcut – https://github.com/aqt/webext-popup/issues/37

Popup Tab https://addons.mozilla.org/addon/popup-tab/ preserves tab history when popping up, and has a keyboard shortcut (Control-Shift-8) that works with Waterfox 56.2.7.1.

Love that you can use this to turn any tab into no-extra-crap fullscreen mode with F11

It's excelente. It does what it describes. I recommend it

Thats just handy. :)

Works really well! Page doesn't get reloaded when switching display mode, and converts both ways between tab view and popup view. Much better than similar extension for Chrome.

I hope this add-on has added the ability to automatically turn pop-up into tab.

Currently this plugin is only able to merge back popups that are popup by this plugin.

This is exactly what I was looking for, thanks much.

but add an option - Alway on Top

Removes the tabs, URL bar, and all other UI elements except the scrollbar and menu bar. Perfect for focusing on the content itself.