Twitter search plugin

Adds Twitter search to Firefox.

Wadoo!

Wadoo! - Web Directory and Search Engine.

Search YouTube, Yahoo, MySpace Videos and More!

Search videos from YouTube, Hulu, Metacafe, Dailymotion, MTV, Ebaumsworld, MySpace, Google, Bing, Yahoo and MORE great sites all on one simple page.

ZaPom searches virtually ALL of your favorite video websites at once and saves your precious time.

Meta-Search Engine & Directory

Searchen Networks®, or Searchen®, is a meta-search engine and directory service designed for the United States. Includes Yahoo, Google, Bing and Ask search engines. Add-on makes Searchen Networks® easily available from your browsers search box.

Google Taiwan 搜索引擎

这个搜索引擎插件是对google台湾的封装，方便中国大陆用户使用。

Spific - Customized Google search

Take your "Googling" to the max with Spific! By using Spific you gain access to thousands of hours of human categorization of search results as well as many powerful but hidden Google features.

Give it a try - We're sure you'll like it!

Knowledge - All-in-one Internet Search (SSL & TLS)

Knowledge - The #1 Science Add-on - Science, Technology, Engineering, Math, Academic Journals - "A must have add-on for making discoveries." Binary App Dev (End-to-End Encryption & Encrypted SSL Suggestions)

搜搜

腾讯搜搜网（www.soso.com）搜索引擎

Weltweite Suchergebnisse von Google

Local List

Local Internet Search Engine

Soft Search

Engine for searching software. Results lead to software information pages with download links. Searches software on more than 25 world biggest software directories.

Google SearchEngine (Language: Dutch, NL)

Dutch language-specific Google search.

Google (Language: EN)

English language-specific Google search.

UK PubMed Central (UKPMC) search

UK PubMed Central (UKPMC) is a unique, free, information resource for biomedical and health researchers. Home page: http://ukpmc.ac.uk

WooSnap!

WooSnap Multi-Site Power Search

EbookPedia.net

EbookPedia.net - free pdf-ebooks search engine

Scholar search (Google)

Add search with Google Scholar to Firefox's search bar.
Tips:
1. Use Ctrl + up/down arrow to switch between installed search engines.
2. Use Ctrl + K to go directly to the search field.
3. Use manage (below engines) to switch the order of engines.

PDFfetch

PDF search engine. Fetches pdf files, ebooks, digital publications, presentations and electronic documents

Yale University Library Search

Search the Yale University Library catalog.

Swobbl

Schützen Sie Ihre Daten im Internet einfach und konsequent!
Swobbl, die Alternative für den Datenschutz.

Mit der Swobbl-Suche durchsuchen Sie das Internet ohne Filterblasen und ohne Datenerfassung unsererseits.