Yoast - Yoast offers plugins to improve SEO and optimize web sites and blogs.
Selection Search - With this extension you can easily search for text you have selected.
Wordfence - Comprehensive security plugin for WordPress.
Swift Selection Search - Swiftly access your search engines in a popup panel when you select text in a webpage.
Jackmail - A newsletter plugin for Wordpress.
Context Search - Context Search is a Firefox extension that expands the context menu's 'Search for' item...