A much-needed addon since Mozilla took away the copy URL button (still have no idea why they did that), but it has stopped working as of Firefox 102.0

Works fine.

It does not work with FF prior to version 56.
Interestingly enough, Mozilla did not remove this Legacy add-on(that does not work) from their site, but instead they removed this one(Copy URL): https://legacycollector.org/firefox-addons/252534/index.html , that works flawlesly, when pressing the button on the toolbar, it simply and easily,quickly copies the active's tab URL(web page address) to clipboard.

Странно на ноутбуке расширение работает (копирует ссылку и ОК высвечивается на кнопке), а на рабочем компе не копирует..

After searching for over 20 mins, I finally found this. Thank you so much

Easiest way to integrate JDownloader for donwloading YouTube videos. No other extension including "Download with JDownloader" works as seamlessly. Simply click the icon and the links of all formats you specified are opened in JDownloader's link grabber.
Thanks mate.