So far no add on works like watch next for opera and google. don't save when hit add to

So I have to copy/paste the url to save the video for later, What's the point of that, better just click the button watch later and that's it. I looking for something like this: https://chrome.google.com/webstore/detail/youtube-real-time-playlis/oblljodddjemphcphienneigmlhhchdm?hl=es&utm_source=chrome-ntp-launcher
It work pretty good but I don't wanna use chrome. Is there a way you can do something like that addon. Thanks man.