Most of these programs for Mozilla Firefox should also work for the Mozilla and SeaMonkey browser series.

• Distracted Reader – Select any text on a webpage to search, read articles right next to it, explore related topics. Fast, versatile, minimal context-switching.

• wikEd, a full-featured in-browser text editor that adds enhanced text processing functions to Wikipedia and other MediaWiki edit pages. Features include wikicode syntax highlighting, regular expression search and replace, and MS Word / HTML to wikicode conversion.
• Comfortable editing functions

• Wikipedia Mashup^{[dead link]} – embeds links on any web page (even outside Wikipedia) to more commonly read Wikipedia articles. Includes the MashLogic platform for running other kinds of mashups.

• Document map extension

• FoxClocks – the FoxClocks extension allows you to have one or more customized clocks displayed in the status bar or toolbar of the Firefox browser. Helpful to have one set to UTC/Wikipedia time, and/or to the time zone of frequent collaborators.

• Gnosis – the Gnosis extension automatically analyzes the Wikipedia page you are browsing and locates people, places, companies, organizations and other entities contained on the page. Each is underlined and additional searches in Wikipedia and other resources can be launched automatically.

• Googlepedia [1] – a Firefox extension that presents Wikipedia articles side by side with Google searches.

• Axon ^{[dead link]} – a Firefox add-on which provides access to the Wordnik dictionary and all Wikipedia articles in every language by double-clicking on a word or selecting text.

• Greasemonkey
  • For Greasemonkey user scripts, see Greasemonkey scripts.

• Picture Popups – enlarge images in place, or open them in HTML popups inside the page – no new windows opened.

• Link Complete auto-complete links to articles in the edit box by pressing tab or ctrl-space.

• Citation and bibliography:
  • Wikipedia:Cite4Wiki – an extension by Jehochman et al. that generates cite format citations for whatever is page currently being viewed.
  • Zotero – a reference and bibliography extension. Can generate citations in many different formats, including Wikpedia's own cite templates.
  • wikipedia-reference-creator – Firefox Addon that helps to generate references from Google Books and similar websites with customizeable output
  • QWiki-Cite — web extension to instantly generate a ((citation)) template for any webpage.

• Search enhancements:
  • Auto Complete – Adds an auto-complete dropdown to the search input in the navigation bar on the left.
  • Highlight searching
  • Search Box - Search and replace in the editbox. Supports regular expressions.
  • Search within Textarea Extension with regex
  • Search across multiple languages/For multilingual searching, see the LuMriX Firefox Search Plugin and Wikipedia:Search#LuMriX.
  • Wiki Quicksearchers - You will need to import this file into your bookmarks file. By Sceptre.
  • URL shortcut – allows typing of "wp" followed by the Wikipedia page name to load that page. If the page doesn't exist, a search is performed.

• Sidebar: Common templates

• WikiDiff – Firefox only extension for tracking and rendering diffs of Wikipedia articles. Essentially like taking a highlighter and marking what is new since your last visit. A diff format easy for newbies. Allows you to watch pages you have visited but never originally intended to watch.

• Wiki Navbar – See this page for instructions and this one for the code. By CheNuevara

• Wikipedia toolbar extension

• Over 500 common templates in HTML format fetched as a sidebar bookmark.

• Wikipedia:Tools/Editing tools § Firefox addons