search suggestion from cache/history:- This idea is from places/bookmarks concept Why not search suggestion also come from pages in my cached pages or history. or the currently opened ones. Chances for them to match is more

Searching through past visited pages could be useful, but tying it in to the search bar would be somewhat awkward - you're history doesn't have anything to do with any of the search engines listed in the search bar, and having your list of previously visited sites appear in a "Google" dropdown would be confusing. Perhaps there could be a "My History" "search engine", but even then we'd need to make it clear that you're searching through history and not "the web". This suggestion ties in more with the Places design that is going to be implemented for Firefox 3, I think, so not really a "Search" bug as much as a "Places" bug, and probably a duplicate.

this is different from "Places". search in history gives me pages i visted yesterday but this enhancement will help user to do a search on web/google for other pages on same topic he/she read yesterday/now

We're not going to expose this via Search, the location bar is a better place to surface this.