Extensions

You can see what extensions have been enabled on your wiki at (with your wiki name instead of "example"):

https://example.miraheze.org/wiki/Special:Version

The list of already installed extensions on Miraheze (this does not mean that you can't request new ones!):
 * https://github.com/miraheze/mediawiki/tree/REL1_30/extensions

Note: The list below can be outdated. Only the link provided above is an accurate representation of what extensions are currently installed at Miraheze.

Extensions FAQ
Mediawiki
 * https://www.mediawiki.org/wiki/Extensions_FAQ

Extensions enabled by default

 * Echo
 * NativeSvgHandler
 * Scribunto
 * AbuseFilter
 * AntiSpoof
 * Babel
 * CategoryTree
 * CentralAuth
 * CheckUser
 * Cite
 * CiteThisPage
 * CodeEditor
 * ConfirmEdit
 * ConfirmEdit/ReCaptchaNoCaptcha
 * Disambiguator
 * Gadgets
 * GlobalBlocking
 * GlobalCssJs
 * InputBox
 * Interwiki
 * LocalisationUpdate
 * ManageWiki
 * MassMessage
 * Math
 * MirahezeMagic
 * Nuke
 * OATHAuth
 * OAuth
 * ParserFunctions
 * Poem
 * RenameUser
 * SiteMatrix
 * Timeline
 * Thanks
 * TitleBlacklist
 * TorBlock
 * WikiEditor
 * CLDR
 * UrlShortner
 * MobileFrontend

Extension available upon request
Want to request one or more of these extensions to be enabled on your Miraheze wiki? Read how to here.

Last Updated On --
 * AccessControl
 * AddHTMLMetaandTitle
 * AdminLinks
 * AJAXPoll
 * ArticleFeedbackV5
 * ArticleRatings
 * AuthorProtect
 * AutoCreateCategoryPages
 * AutomaticBoardWelcome
 * BetaFeatures
 * BlogPage
 * MSCalender
 * Capiunto
 * Cargo
 * CharInsert
 * CollabsibleVector
 * Comments
 * ContactPage
 * CookieWarning
 * CreatePage
 * CreateWiki
 * CSS
 * CustomNavBlocks
 * DPLForum
 * DynamicPageList
 * DynamicPageList3
 * Editcount
 * EducationProgranm
 * FancyBoxThumbs
 * FlaggedRevs
 * Flow
 * FeaturedFeeds
 * GroupsSidebar
 * HeaderTabs
 * HideSection
 * HighlightLinksInCategory
 * ImageMap
 * JavascriptSlideshow
 * Josa
 * LabledSectionTransclusion
 * LinkSuggest
 * Loops
 * Maps
 * MassEditRegex
 * MediaWikiChat
 * Moderation
 * MsUpload
 * MsLinks
 * MsCatSelect
 * MultimediaViewer
 * MultiBoilerPlate
 * NewestPages
 * Newsletter
 * NewUserMessage
 * NewsUsersList
 * NoTitle
 * PageForms
 * PageTitle
 * PDFEmbed
 * PDFHandler
 * Poll
 * Popups
 * ProtectSite
 * Quiz
 * RandomSelection
 * RelatedArticles
 * ReplaceText
 * RSS
 * SandboxLinks
 * ScratchBlocks
 * SimpleToolTip
 * SiteScout
 * SocialProfile
 * SubPageFun
 * SubPageList3
 * SyntaxHighlight
 * Tabber
 * Tabs
 * Translate
 * TimedMediaHandler
 * TitleKey
 * Variables
 * VisualEditor
 * WebChat
 * Widgets
 * WikiBase
 * WikiForum
 * WikiHiero
 * WikiLove
 * WikiTextLoggedInOut
 * YouTube

Declined extensions (<1.29)
Those extensions which are not available and a brief reason.
 * BlueSpice - security risk
 * Configure - working on a similar extension and doesn't work with MediaWiki 1.28
 * ConfirmAccount - incompatible with CentralAuth
 * DeleteBatch - because of technical limitations, see T956
 * DNSLookup - invades user privacy
 * DynamicPageList - flagged as unmaintained
 * EditAccount - incompatible with CentralAuth
 * EmbedAnything - security risk
 * EmbedVideo - security risk
 * External Data - SQL injection
 * ExternalLinks - security risk, see T1555
 * Html5mediator - declined due to security issues (arbitrary JS insertion), T1640. Use Widget:Html5media instead.
 * MiniInvite - security risk
 * MultiUpload - flagged as unmaintained, instead MsUpload
 * SecurePoll - reveals private information
 * Semantic MediaWiki - alters MediaWiki too much.
 * Semantic Text Annotator - requires Semantic MediaWiki
 * Site settings - working on a similar extension
 * Tasks_Extension - flagged as unstable
 * UploadWizard - Extension is too specific for Wikimedia. Unsuitable for independent wikis to be using it.
 * UserMerge - incompatible with CentralAuth
 * Username - invades user privacy
 * WikiBanner - we don't accept ads

Disclaimer

 * Some extensions enabled by default cannot be managed/used by individual local communities at this time. These include CheckUser, RenameUser and GlobalBlocking (which are currently limited to global Stewards) and some extensions only have a function on Meta such as CreateWiki.
 * Extensions not used by Miraheze or Wikimedia Foundation (a organization we trust to do rigorous security review) must pass security review by our volunteers. It may take long time to process.