Extension:CategoryTagSorter

The CategoryTagSorter extension alphabetizes category links at the bottom of an article.

Description
A MediaWiki page typically displays the list of category links in the order in which they appear in the article. For articles with many categories, it can be difficult for readers to find the category they're looking for. This extension fixes this by alphabetizing category links.

Sorting is ascii-betical, which usually works out OK as most wikis are configured to have the first letter of a title be uppercase (see .)

This extension includes a user preference for individuals who prefer MediaWiki's default behavior.

User preference option
This extension provides a user-preference option added in the Appearance section which allows users to turn off the alphabetizing of the categories. By default this extension is enabled. To set the default behavior to disabled (a opt-in type of extension), set the  preference to   in the default user preferences. Like so: