Link from GitHub to Popup Tab at addons.mozilla.org (AMO)

Popup Tab

A Firefox addon, easily convert a tab into a popup and vice versa.

Convert a tab into a popup window.
Convert the popup window back to a tab, and insert back to original window.
The tab is actually "moved" between the normal window and the popup window, so you don't have to reload the page.
The popup window size is maintained based on the domain. You can also make it remember the window size of a specific URL.

0.3.1 (Jul 18, 2021)
- Add: store popup window size according to the entire URL (without search params, hash).
0.3.0 (Mar 7, 2020)
- Refactor: source tree.
- Add: store popup window size.
0.2.0 (Feb 11, 2019)
- Fix: focus the tab after the tab is merged.
- Add: popup tab/merge popup hotkey. Note that the hotkey is only configurable on Firefox 66+.
0.1.1 (Mar 18, 2017)
- Compat with Firefox < 53. Tab menu is only available on Firefox 53+.
0.1.0 (Mar 17, 2017)
- First release.

	function createFromURL(parentTab, url) {
	_create({url}, w => {
	const parentPopup = popups.get(parentTab.windowId);
	if (parentPopup) {
	w.parent = parentPopup.parent;
	w.index = parentPopup.index;
	} else {
	w.parent = parentTab.windowId;
	w.index = parentTab.index + 1;
	}
	});
	}