do search/replace for text on web page with chrome extension

Need a Chrome extension that makes modifications to a web page. The extension maintains a list of search & replace values. Example: search for text "designation" and replace with "title:". There can be multiple search/replace values per domain. Search & replace in the DOM. Should support plain text search and regular expressions. -Search/replace should be done so loaded page shows changes -Each domain can have multiple search & replace options -Extension button in the toolbar brings up a grid with search replace values for that domain -Will provide mock up idea for winning freelancer