diff --git a/DefaultSettings.php b/DefaultSettings.php
deleted file mode 100644
index 7cd9466..0000000
--- a/DefaultSettings.php
+++ /dev/null
@@ -1,46 +0,0 @@
-<?php
-
-/**
- * DO NOT EDIT!
- *
- * The following default settings are to be used by the extension itself,
- * please modify settings in the LocalSettings file.
- *
- * @codeCoverageIgnore
- */
-if ( !defined( 'MEDIAWIKI' ) ) {
-	die( 'This file is part of the SemanticMetaTags extension, it is not a valid entry point.' );
-}
-
-/**
- * An array of tags that assigns related properties such as:
- *
- * 'keywords' => array( 'Has keywords', ... )
- */
-$GLOBALS['smtgTagsProperties'] = $GLOBALS['smtgTagsProperties'] ?? [];
-
-/**
- * Describes static content for an assigned `<meta>` tag
- *
- * 'some:tag' => 'Content that is static'
- */
-$GLOBALS['smtgTagsStrings'] = $GLOBALS['smtgTagsStrings'] ?? [];
-
-/**
- * Listed tags are generally assumed to be reserved or excluded for free use
- */
-$GLOBALS['smtgTagsBlacklist'] = $GLOBALS['smtgTagsBlacklist'] ?? [
-	'generator',
-	'robots'
-];
-
-/**
- * In case it is set `true` then the first property that returns a valid content
- * for an assigned tag will be used  exclusively.
- */
-$GLOBALS['smtgTagsPropertyFallbackUsage'] = $GLOBALS['smtgTagsPropertyFallbackUsage'] ?? false;
-
-/**
- * Identifies prefixes that require `meta:property:...`
- */
-$GLOBALS['smtgMetaPropertyPrefixes'] = $GLOBALS['smtgMetaPropertyPrefixes'] ?? [ 'og:' ];
diff --git a/RELEASE-NOTES.md b/RELEASE-NOTES.md
index 41e5358..769e104 100644
--- a/RELEASE-NOTES.md
+++ b/RELEASE-NOTES.md
@@ -7,6 +7,7 @@ This file contains the RELEASE-NOTES of the **Semantic Meta Tags** (a.k.a. SMT)
   * Semantic MediaWiki to version 7.0 and later
   * MediaWiki to version 1.43 and later
 * Updated to Semantic MediaWiki 7.0's namespaced data-item classes
+* Moved the extension registration and settings defaults into `extension.json` (the `$smtg…` configuration variable names are unchanged)
 * The major version jumps from 4.x to 7.0 to track the Semantic MediaWiki release it supports
 
 ### 4.1.1
diff --git a/SemanticMetaTags.php b/SemanticMetaTags.php
deleted file mode 100644
index d230559..0000000
--- a/SemanticMetaTags.php
+++ /dev/null
@@ -1,93 +0,0 @@
-<?php
-
-use SMT\HookRegistry;
-use SMT\Options;
-use SMW\Services\ServicesFactory as ApplicationFactory;
-
-/**
- * @see https://github.com/SemanticMediaWiki/SemanticMetaTags/
- *
- * @defgroup SMT Semantic Meta Tags
- */
-
-SemanticMetaTags::load();
-
-/**
- * @codeCoverageIgnore
- */
-class SemanticMetaTags {
-
-	/**
-	 * @since 1.4
-	 *
-	 * @note It is expected that this function is loaded before LocalSettings.php
-	 * to ensure that settings and global functions are available by the time
-	 * the extension is activated.
-	 */
-	public static function load() {
-		if ( !defined( 'MEDIAWIKI' ) ) {
-			return;
-		}
-
-		// Load DefaultSettings
-		require_once __DIR__ . '/DefaultSettings.php';
-
-		if ( is_readable( __DIR__ . '/vendor/autoload.php' ) ) {
-			include_once __DIR__ . '/vendor/autoload.php';
-		}
-	}
-
-	/**
-	 * @since 1.0
-	 */
-	public static function initExtension( $credits = [] ) {
-		// See https://phabricator.wikimedia.org/T151136
-		define( 'SMT_VERSION', isset( $credits['version'] ) ? $credits['version'] : 'UNKNOWN' );
-
-		// Register message files
-		$GLOBALS['wgMessagesDirs']['SemanticMetaTags'] = __DIR__ . '/i18n';
-	}
-
-	/**
-	 * @since 1.4
-	 */
-	public static function doCheckRequirements() {
-		if ( version_compare( $GLOBALS[ 'wgVersion' ], '1.27', 'lt' ) ) {
-			die( '<b>Error:</b> This version of <a href="https://github.com/SemanticMediaWiki/SemanticMetaTags/">SemanticMetaTags</a> is only compatible with MediaWiki 1.27 or above. You need to upgrade MediaWiki first.' );
-		}
-	}
-
-	/**
-	 * @since 1.0
-	 */
-	public static function onExtensionFunction() {
-		if ( !defined( 'SMW_VERSION' ) ) {
-
-			if ( PHP_SAPI === 'cli' || PHP_SAPI === 'phpdbg' ) {
-				die( "\nThe 'Semantic Meta Tags' extension requires 'Semantic MediaWiki' to be installed and enabled.\n" );
-			} else {
-				die(
-					'<b>Error:</b> The <a href="https://www.semantic-mediawiki.org/wiki/Extension:Semantic_Meta_Tags">Semantic Meta Tags</a> ' .
-					'extension requires <a href="https://www.semantic-mediawiki.org/wiki/Semantic_MediaWiki">Semantic MediaWiki</a> to be ' .
-					'installed and enabled.<br>'
-				);
-			}
-		}
-
-		$configuration = [
-			'metaTagsContentPropertySelector' => $GLOBALS['smtgTagsProperties'],
-			'metaTagsStaticContentDescriptor' => $GLOBALS['smtgTagsStrings'],
-			'metaTagsBlacklist' => $GLOBALS['smtgTagsBlacklist'],
-			'metaTagsFallbackUseForMultipleProperties' => $GLOBALS['smtgTagsPropertyFallbackUsage'],
-			'metaTagsMetaPropertyPrefixes' => $GLOBALS['smtgMetaPropertyPrefixes']
-		];
-
-		$hookRegistry = new HookRegistry(
-			ApplicationFactory::getInstance()->getStore(),
-			new Options( $configuration )
-		);
-
-		$hookRegistry->register();
-	}
-
-}
diff --git a/extension.json b/extension.json
index a6d3fcc..2d3a94c 100644
--- a/extension.json
+++ b/extension.json
@@ -20,19 +20,43 @@
 			"i18n"
 		]
 	},
-	"callback": "SemanticMetaTags::initExtension",
 	"ExtensionFunctions": [
-		"SemanticMetaTags::onExtensionFunction"
+		"SMT\\Setup::onExtensionFunction"
 	],
-	"AutoloadClasses": {
-		"SemanticMetaTags": "SemanticMetaTags.php"
-	},
 	"AutoloadNamespaces": {
 		"SMT\\": "src/"
 	},
 	"TestAutoloadNamespaces": {
 		"SMT\\Tests\\": "tests/phpunit/"
 	},
+	"config_prefix": "smtg",
+	"config": {
+		"TagsProperties": {
+			"value": [],
+			"description": "An array of tags that assigns related properties such as `'keywords' => [ 'Has keywords', ... ]`."
+		},
+		"TagsStrings": {
+			"value": [],
+			"description": "Describes static content for an assigned `<meta>` tag such as `'some:tag' => 'Content that is static'`."
+		},
+		"TagsBlacklist": {
+			"value": [
+				"generator",
+				"robots"
+			],
+			"description": "Listed tags are generally assumed to be reserved or excluded for free use."
+		},
+		"TagsPropertyFallbackUsage": {
+			"value": false,
+			"description": "In case it is set `true` then the first property that returns a valid content for an assigned tag will be used exclusively."
+		},
+		"MetaPropertyPrefixes": {
+			"value": [
+				"og:"
+			],
+			"description": "Identifies prefixes that require `meta:property:...`."
+		}
+	},
 	"load_composer_autoloader": true,
 	"manifest_version": 2
 }
diff --git a/src/Setup.php b/src/Setup.php
new file mode 100644
index 0000000..8d71961
--- /dev/null
+++ b/src/Setup.php
@@ -0,0 +1,35 @@
+<?php
+
+namespace SMT;
+
+use SMW\Services\ServicesFactory as ApplicationFactory;
+
+/**
+ * @license GPL-2.0-or-later
+ * @since 7.0
+ *
+ * @author mwjames
+ */
+class Setup {
+
+	/**
+	 * @since 7.0
+	 */
+	public static function onExtensionFunction() {
+		$configuration = [
+			'metaTagsContentPropertySelector' => $GLOBALS['smtgTagsProperties'],
+			'metaTagsStaticContentDescriptor' => $GLOBALS['smtgTagsStrings'],
+			'metaTagsBlacklist' => $GLOBALS['smtgTagsBlacklist'],
+			'metaTagsFallbackUseForMultipleProperties' => $GLOBALS['smtgTagsPropertyFallbackUsage'],
+			'metaTagsMetaPropertyPrefixes' => $GLOBALS['smtgMetaPropertyPrefixes']
+		];
+
+		$hookRegistry = new HookRegistry(
+			ApplicationFactory::getInstance()->getStore(),
+			new Options( $configuration )
+		);
+
+		$hookRegistry->register();
+	}
+
+}
diff --git a/tests/bootstrap.php b/tests/bootstrap.php
index ba7aa74..b85d848 100644
--- a/tests/bootstrap.php
+++ b/tests/bootstrap.php
@@ -12,17 +12,15 @@
 	die( "\nThe Semantic MediaWiki test autoloader is not available" );
 }
 
-if ( !defined( 'SMT_VERSION' ) ) {
-	die( "\nSemantic Meta Tags is not available, please check your Composer or LocalSettings.php.\n" );
-}
-
 $width = 20;
 
 if ( !defined( 'SMW_PHPUNIT_FIRST_COLUMN_WIDTH' ) ) {
 	define( 'SMW_PHPUNIT_FIRST_COLUMN_WIDTH', $width );
 }
 
-print sprintf( "\n%-{$width}s%s\n", "Semantic Meta Tags: ", SMT_VERSION );
+$extensionInfo = json_decode( file_get_contents( __DIR__ . '/../extension.json' ), true );
+
+print sprintf( "\n%-{$width}s%s\n", "Semantic Meta Tags: ", $extensionInfo['version'] ?? 'UNKNOWN' );
 
 $autoLoader = require SMW_PHPUNIT_AUTOLOADER_FILE;
 $autoloader->addPsr4( 'SMT\\Tests\\', __DIR__ . '/phpunit/Unit' );
diff --git a/tests/phpunit/Integration/I18nJsonFileIntegrityTest.php b/tests/phpunit/Integration/I18nJsonFileIntegrityTest.php
index fc9c175..6bf0dfd 100644
--- a/tests/phpunit/Integration/I18nJsonFileIntegrityTest.php
+++ b/tests/phpunit/Integration/I18nJsonFileIntegrityTest.php
@@ -38,6 +38,10 @@ public function i18nFileProvider() {
 		$provider = [];
 		$location = $GLOBALS['wgMessagesDirs']['SemanticMetaTags'];
 
+		if ( is_array( $location ) ) {
+			$location = $location[0];
+		}
+
 		$bulkFileProvider = UtilityFactory::getInstance()->newBulkFileProvider( $location );
 		$bulkFileProvider->searchByFileExtension( 'json' );