Chrome actually already has this built in, too. If you close your window, you'll get a browsable "x tabs" entry in your browsing history. An additional 20-30 MB of memory could be saved by not installing this extension.
The underlying problem here is workflow.
People are leaving tabs open as a reminder of things to which they intend to return. (Regardless of whether they will or not; that's another discussion.) And they're not bookmarking, because bookmarking begs organizational overhead, which leads to its own mess. (neither tags nor folders are great or sufficient)
And who knows if a bookmark will still point to the content you intended, when you finally get back to it?
So the problem is ultimately that bookmarking is broken, both for quick reference and longer-term storage. So why not fix that?
Why not a system where bookmarking a site saves a copy to a (cloud-stored) cache. [1] And then searches can be done on the content in that cache. And hits can be served both from the cache, and a simultaneously downloaded 'live' result, available with a toggle. [2]
So that one can bookmark a brag-post about a neat jquery-enabled dropdown list and not have to worry about categorizing it, nor whether or not it will be there in a year, and be confident that they can refer to it again with a simple search of any of the key words that occur to them. [3]
[1] Because one can never know what will happen to content online (changes, broken links, takedowns, etc) and doing a federated search across thousands of bookmarked sites looking for 'jquery dropdown' is going to be a nightmare.
[2] Room here for a great feature of non-trivial difficulty: change-detection and display of diffs (if any) rendered in-line.
[3] Or even searching by meta-data such as date-of-bookmark, location or source-device. "That thing I was reading on my phone last spring, when I was stuck in Chicago on business..." can be surprisingly useful when searching.
Because it wouldn't consist of randomly spidered or submitted noise. It would only be things explicitly identified as useful or interesting.
And you could rank by how many people bookmarked it, when the bookmarks happened, who they are, etc -- alongside already-useful PageRank attributes.
It'd be like +1 data, but the +1 would have meaning behind it.
The very creation of a network of mannequins would seem to run counter to the big goal of most SEO (traffic, now) as the mannequins would require months-to-years of seemingly-valid traffic of build-up to become relevant and then a very slow-and-cautious release of bookmarks to the desired spam to even attempt to avoid detection and thus nullification of all the preceding effort.
And the user-expectation of such a search would be heavily weighted to prior personal activity [1]. So even if mannequins were successfully pumping bookmarks to promote some site that just scraped stack-exchange, if you and I were bookmarking stack-exchange, we should always get the real links bubbling to the top.
[1] Yes, this would raise a lot of the same "echo chamber" concerns that people have with Google search, but if it matches the user expectation, I don't see a problem with it.
1. I bookmark lots of sites but rarely go back to them (mainly because it's hard to find what I'm looking for)
2. Sometimes I spend ages looking through my history to find something I remember seeing but didn't bookmark
3. I leave dozens of tabs open because I think I'm going to refer back to them but 50% of the time never do. The order and which window they were grouped with is info I need for context.
So I want -
1. a full-text search of history or bookmarks (I haven't decided which)
2. someway to really quickly convert my open tabs to history/bookmarks
3. A psychic computer that knows when I meant to bookmark something ;-)
I know some extensions can help with this but I've never found the ideal one yet. Suggestions appreciated.
Though the logistics of cloud-storing every single page every user visits would quickly become non-trivial.
And your want #2 seems like a simple UI task. IE already has/had a "bookmark all open tabs"-style menu option -- and I thought the others did too, but I'm not seeing it at the moment.
https://kippt.com http://pinboard.in
Pinboard already has archiving, Kippt archiving is in beta.
Still, there's room for improvement.
"Infinite pages" are also breaking search. Google finds a hit but you die of boredom before you can actually scroll down that far....