Google chrome Extensions 
Chrome Web store 
Wordpress Plugins 
Mozilla Firefox Addons 
Free PDF Search Engine and PDF Viewer Toolbar
Deep Web Search Engine. If you know little bit of javascript, you should be able to create your own category and share a site through Samucaya Designer graphical interface. This is more than sharing a bookmark, you are sharing a behavior of a site
Where-to-buy.in is India’s biggest shopping search engine. A search engine focused to provide best results for shoppers in India.
Okapiland Search Toolbar (Okapibar) provides Internet search in Composite Page Mode (CPM) that displays linked pages themselves in addition to hyperlinks. All pages can be displayed by scrolling the pages. Internet Search is good for the quick...
Get a Google custom search engine with beautiful backgrounds every time you open a new tab.
After installing, simply go to http://www.searchslate.com and select a new theme if you want to change.
Easily reach the 'Manage Search Engines' dialog using a toolbar icon!
This FREE Netword Extension, a patented technology, is a fun way to discover new local businesses in your neighborhood and help you save BIG with great discounts, coupons, or deals to your favorite stores!
Allows you to search the website currently viewed with the website's internal search engine (and not the default FF search engine or an external engine). Ex: on viewing http://wired.com STS calculates http://wired.com/search?query=%s&siteAlias=all.
Australis was the code name for the current Firefox theme, it aimed to make a great browser look awesome. Now you can go one step further and also make it feel awesome to use!
Whichever web page you visit, use this tool to search over linked content. Just click the 'G'-with-chain-link icon in your status bar to open or close the toolbar (or ctrl-alt-s). Great for searching from tables-of-contents, bookmarks, or blogs!
