Search

• Ubiquity (Beta): search tool mashup.
• Mozilla Internet Dictionary: tabbed dictionary browser using the language dictionary resources on the Internet.
• Context Search: Search right from the context menu.
• SearchWith: Similar to Context Search extension but provides additional features, such as multiple search, edit the search query (Shift key) or add quotes (Ctrl key).
• ConQuery: context searching and URL manipulation tool for advanced users.
• Scroll Search Engines: change the search engine by scrolling the mouse.
• Firefox Search Sidebar: search with several engines at the same time and manage your plugins easily from the sidebar.
• Google Side Search: search with Google from the sidebar.
• WordReference Translator: search selected text in Wordreference from the context menu or pressing 'D'.
• Inline Google Definitions: shows Google definitions without leaving the tab.
• Add to search bar: Just right click on any search box and choose ''Add to Search Bar''. Really useful.
• OpenSearchFox: same features as ''Add to search bar''.
• Customize Google: this extension removes the ads in Google services and offers also many other options, such as language defaults or search streaming.
• Googlepedia: displays Wikipedia articles in Google search results.
• GoogleEnhancer: adds favicons, numbering and highlighting to Google search results.
• Coogle: highlights search terms in webpages brought up through Google search.
• Search Keys: keyboard shortcuts for Google search results.
• WikiLook: look up Wiktionary in any language right under your mouse pointer.
• KeywordSelection: automatically perform a search by selecting some text and clicking on a keyword-enabled bookmark.
• Zotero: advanced search, data mining, citation export, storage of any information source, etc. Designed to make much easier researching on the Internet. Note: it's quite ''heavy'', almost 1MB.
• Second Search: search with other engines without switching the engine of the search bar.
• Peers: search previews for your searchbar.
• CyberSearch: shows Google results in the address bar.
• SearchLoad Options: adds a menu for changing the default behaviour of the searchbar.
• Find In Numbers: displays the number of matched items when searching in web pages.
• SearchLoad Options: menu for tweaking the searchbar's default behaviour.
• Find in Tabs: Searches for text in all tabs.
• Open-Tran: context menu item for searching selected terms in |Opentran.
• BabelZilla Glossary Extension: context menu search of selected text via BabelZilla Glossary.

See also Google Tricks for Translators.

Tabs

• Tab History: if you open a link in a new tab it will keep the history of the 'mother tab'.
• Tabs Open Relative: tabs are opened to the right of the current one instead of at the very end.
• Undo Closed Tabs Button: reopen recently closed tabs.
• Permatabs: lock those tabs you don't want to close by accident.
• Multiple Tab Handler : handle multiple tabs (close, reload, etc.).
• Ctrl Tab Preview: preview tags when you toggle between them with Ctrl + Tab.

Save Time

• Paste and Go 2: one click for loading URLs from the clipboard.
• QuickDrag: Use simple mouse gestures to quickly load URLs, do web searches of selected text on a page or save an image. For example, if you want to look up a word with your preferred search engine/dictionary, just select the text, drag and drop it anywhere on the page and voilà! Firefox will do a search with the selected search engine in a new tab. Isn't it great?
• All-in-one sidebar: bookmarks, downloads, extensions, buttons or even web pages, everything can be loaded in a clean, fully-customizable sidebar.
• Taboo: save pages for later, useful if you usually have many tabs opened at the same time.
• iMacros for Firefox: create and manage macros within Firefox.
• Copy plain text: Option in the context menu.
• Converter: Contextual unit and time zone conversion on any web page.
• Formfiller: add custom text to the context menu.
• KeyConfig: create custom keyboard shortcuts.
• Auto Dial: quick access to frequently visited pages on new tabs.

Save space

• Menu editor: Get rid of those options you never use.
• Hide menubar: Hides the menubar, it appears again by pressing the Alt key.
• Chromedit: edit the Firefox's local profiles easily and right from you browser.

Office

• Zooos Office: turns Firefox into a full blown office suite. It can read/write/edit MS office, OpenOffice.org, SVG and various other file formats.
• Google notebook: open a mini-window just with one click to manage all your notes.
• Open IT Online: open any office document, spreadsheet or presentation right from your browser, without installing any additional software.
• PdfMeNot (experimental): displays PDFs in an embedded Flash viewer.
• PDF Download: gives you the option to open, download, or convert to HTML when trying to open PDF files.

RSS Readers

• Sage-Too
• Wizz
• Read4me
• NewsFox
• Google Reader Watcher: check your unread feeds at Google Reader.

More info on RSS Feeds.

Security

• FEBE: easily backup all your browser's extensions, bookmarks, preferences, passwords, etc. Includes scheduling function.
• CLEO: this extension works with FEBE to package any number of extensions/themes into a single, installable .xpi file.
• OPIE: exports the preferences of your your installed extensions.
• Password Exporter: export your saved passwords.

Others

• Adblock Plus: removes text ads and banners.
• Flashblock: blocks any Flash content; instead, you'll see a 'Play' button.
• Minimizetotray: minimize Firefox to the system tray.
• Pronounce: pronounce an English word using the Merriam-Webster online dictionary.
• FoxClocks: check the time around the world from the statusbar.
• Grab And Drag: adds grab and drag page scrolling.
• Nuke Anything Enhanced: hide any selection or object in a web page via the context menu.
• Blank Canvas Gmail Signatures: multiple HTML signatures for Gmail.

See Firefox Tricks for more information.

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