Love the idea... Rated 3 out of 5 stars
but, there are problems with the previews mine shows after running the setup in the background. Whether the previews will be correct after I visit bookmarked sites or not remains to be seen. I got this last night, ran the background "tool" for lack of a better word and the resulting screen shots are just two problems out of MANY. I have previews for sites that I don't even have bookmarked. (I did not feel like searching through to find that one)
You'll notice many blank previews on one of these screen shots. You'll also notice that the site highlighted has nothing to do with the site that is previewed on both shots. And that the same previewed site is shown for multiple links. That site is NOT bookmarked in that folder and where it is bookmarked is not done multiple times to my knowledge.
Again, love this idea, when it's working properly. I'm not ditching the extension yet. Just can't give it high marks yet either.