Be it this 'Popup Window' or the other similar 'Popup' extension, both face an issue when merging back to a tab and only 1 tab is opened, in particular userChromeJS scripts fail after Merge.
Hence, an option to prevent the extension from running when only 1 tab is opened would be welcomed.

Works well with some issues:

- Maximize button on pop-up window is disabled/greyed out--pop-up windows cannot be maximized with the maximize button
- would be nice if the pop-up windows was the same size as the window it was "popping up" from, rather than a pre-determined size

Nice extension. Is it possible to implement alt + click, left + right click or something similar for activation?

The extension used to hide the mac title bar on the standalone windows, but this has recently stopped working. Any ideas why?

Great add-on! Is there a way to customize the title of the new window? It currently starts with the URL - {title}

I use the WindowTitler add-on (https://addons.mozilla.org/en-US/firefox/addon/window-titler) to add a prefix to my Firefox windows, but the keyboard shortcut to bring up that extension doesn't work in these "popup" windows. Having a way to access that extension would be a workable way to (manually) fix the titlebar.

This addon has a huge potential! You should make that the windows automatically get miximized, pixel sizeing in the opitons not always do the work. Also, you should work on getting a full screen view, but without hidding the windows bar, so it looks really like a Web App. Hope you take this suggestion.

only problem is the window wont dock like normal windows and you cant use the full screen button

Please add a keyboard shortcut and this will be a 5/5 extension!

This is what I was looking for, but if there could be a keyboard shortcut it would be perfect.

Popup works, but can't snap at screen edges like others do. Would be nice to add snappable windows.

Would be nice to be able to turn back into tab. Otherwise, very nice. Good for video, in conjunction with "Maximize video" extension.

How set pop-up windows as always on top?

When watching YT videos (embeded) the picture freezes after sometime, until I hover cursor over it. Otherwise I love the add-on, just what I wanted.

Good addon; it does what it promises. What would be a great addition is a hotkey to pop-up/merge back the current tab (even better if customizable, but a fixed hotkey would be ok too). This should be helpful for power users who like a minimalist UI and don't want to touch the mouse at all if possible.

It is not perfect however; sometimes the popup window which is created cannot be maximized, and the merging back into the main window behaves weirdly when you have multiple normal browser windows open. This is probably not the developer's fault and somehow related to WebExtensions, but it would be nice if those kinks where ironed out in the future.