your browser extension sounds so sick (heard about it 20 minutes ago on the Crystal post) - any chance you'd make it available, or are you concerned some villain would use it to perform title based post manipulation?
which searches for discussions on HN, Reddit, Lobsters, etc for a given url.
It also has a bookmarklet so it can be used on any page very easly.
eg for this post: https://quarchive.com/shares/bJ3iG3rg3UbvT5fxgjtCSUgr
EDIT: how to do it for yourself: register, bookmark the page in your browser and then open quarchive.com to see the comments on hn/reddit etc. If you have ideas send me an email