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_27/extensions

Changes to extension are documented on:

https://phabricator.miraheze.org/

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

Extensions enabled by default
*Echo *NativeSvgHandler *Scribunto *AbuseFilter *AntiSpoof *Babel *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 *WikiEditor *CLDR *UrlShortner *MobileFrontend

Extension List
Last Updated On 2016-09-23 Collected from /srv/mediawiki/w/extensions using "ls -1"
 * AbuseFilter
 * AccessControl
 * AddHTMLMetaAndTitle
 * AdminLinks
 * AJAXPoll
 * AntiSpoof
 * AuthorProtect
 * Babel
 * BetaFeatures
 * BlogPage
 * CategoryTree
 * CentralAuth
 * CharInsert
 * CheckUser
 * Cite
 * CiteThisPage
 * cldr
 * CodeEditor
 * CollapsibleVector
 * Comments
 * ConfirmEdit
 * ContactPage
 * ContentTranslation
 * CookieWarning
 * CreateWiki
 * CSS
 * CustomData
 * CustomNavBlocks
 * Disambiguator
 * DPLForum
 * DynamicPageList
 * Echo
 * Editcount
 * EmbedVideo
 * FancyBoxThumbs
 * FeaturedFeeds
 * Flow
 * Gadgets
 * GlobalBlocking
 * GlobalCssJs
 * googleAnalytics
 * HeaderTabs
 * HighlightLinksInCategory
 * ImageMap
 * InputBox
 * Interwiki
 * JavascriptSlideshow
 * Josa
 * LabeledSectionTransclusion
 * LinkSuggest
 * Loops
 * Maps
 * MassEditRegex
 * MassMessage
 * Math
 * MirahezeMagic
 * MobileFrontend
 * MsCalendar
 * MsCatSelect
 * MsLinks
 * MsUpload
 * MultiBoilerplate
 * MultimediaViewer
 * MultiUpload
 * MwEmbedSupport
 * NativeSvgHandler
 * NewestPages
 * NewUserMessage
 * NoTitle
 * Nuke
 * OAuth
 * OpenGraphMeta
 * PageImages
 * PageNotice
 * PageTriage
 * ParserFunctions
 * PDFEmbed
 * Poem
 * Poll
 * Popups
 * RandomSelection
 * RelatedArticles
 * Renameuser
 * ReplaceText
 * RSS
 * SandboxLink
 * ScratchBlocks
 * Scribunto
 * SectionHide
 * SimpleTooltip
 * SiteMatrix
 * SocialProfile
 * SpamBlacklist
 * SubpageFun
 * SubPageList3
 * SyntaxHighlight_GeSHi
 * Tabber
 * Tabs
 * TemplateData
 * TemplateSandbox
 * TextExtracts
 * Thanks
 * TimedMediaHandler
 * Timeline
 * TitleBlacklist
 * TitleKey
 * Translate
 * UniversalLanguageSelector
 * UrlShortener
 * Variables
 * VisualEditor
 * VoteNY
 * WebChat
 * Widgets
 * Wikibase
 * WikiEditor
 * WikiForum
 * WikiLove
 * YouTube