This is great, and is something I've wanted for a while. I use pinboard which is supposed to have similar capabilities (click 'search full text', 'search mine' after turning on and paying for 'archiving'), but I've never been totally confident in it (pages would change, and the cached version was updated to a 404 page), and ended up letting my archiving subscription lapse.
I think google used to offer something that did this as well as search all your local files, but I think that went the way of all gThings.
I think google used to offer something that did this as well as search all your local files, but I think that went the way of all gThings.