simple add-on and blazing fast service by archive.today!!
Till yesterday I used archiveror add-on which does the same job but requires 2 clicks. This one is better as it does the job in single click. Also, I prefer this website over all others including wayback, as it provides the url instantaneously and the length of url is short as well. Recently I found out that archive.is can be used as an workaround to read articles behind paywall/registration like NYT and washington post, I don't know how this works but it's like magic!!
Great job by the developers of the website and addon.
My only suggestion is to include an option to open the archive tab in background like in archiveor addon.

Also, I am greedy and I want more !! - please make a simple android app just like this, which can be used by clicking on share button on any app e.g. for twitter app: click share button > share tweet via > choose archive app icon > redirects to default browser with url just like this add-on > https : // archive . today/?run=1&url=

Edit - Developer has responded so promptly and clarified that this feature already exists! 10/10