Thanks, I don't know what happened why it is not archived properly.
I used to use archive.* in the past, but it is not working on my end that's why I uses web.archive.
We shouldn't install any addon if we don't have knowledge about what we are going to install. It would harm us even it would keep role to hack our device. Besides that, sound like scammy to me. Offer something like double your bitcoin within short of time is obvious scam. It's more better to stay away from such as offer. Likely moderators deleted scammer's thread due malicious links.
I agree that we shouldn't install any third party add-on specially coming from a newbie account. But we can't discount the fact that many are blindly trusting anyone specially if they see that they can supposedly double their bitcoins.
@sujonali1819 - thanks, I will update the OP with those links.