Trufflepiggy - Quick Search - The all-in-one search addon: just select and search. Find on multiple websites at once. Search via overlay, context menu or omnibar. Featuring anonymous profiles. Easy setup: select from 1000+ user generated searches. Cross-browser sync.
Swift Selection Search - Swiftly access your search engines in a popup panel when you select text in a webpage.
Context Search - Context Search is a Firefox extension that expands the context menu's 'Search for' item...
Selection Search - With this extension you can easily search for text you have selected.
SearchWP for Firefox - Jump-to-word buttons and highlighting for the search box content
Trufflepiggy - Context Search - The context menu search for all of us: quick, easy & customizable. Best in class group-search: find on multiple sites at once! Supports favicons (Firefox), omnibox & cross browser sync. Select from 1000+ user generated searches or add your own.