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diff --git a/lib/core-extensions/README.md b/lib/core-extensions/README.md
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+# FreshRSS core extensions
+
+This directory contains some core extensions shipped with FreshRSS.
+
+For custom third-party extensions, use the `./FreshRSS/extensions/` directory instead.
diff --git a/lib/core-extensions/Tumblr-GDPR/README.md b/lib/core-extensions/Tumblr-GDPR/README.md
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+# Tumblr-GDPR
+
+Needed for accessing [Tumblr](https://www.tumblr.com/) RSS feeds from the European Union:
+bypass the [GPDR](https://en.wikipedia.org/wiki/General_Data_Protection_Regulation) check, implying consent.
diff --git a/lib/core-extensions/Tumblr-GDPR/extension.php b/lib/core-extensions/Tumblr-GDPR/extension.php
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+++ b/lib/core-extensions/Tumblr-GDPR/extension.php
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+<?php
+
+class TumblrGdprExtension extends Minz_Extension {
+	public function init() {
+		$this->registerHook('simplepie_before_init', array('TumblrGdprExtension', 'curlHook'));
+	}
+
+	public static function curlHook($simplePie, $feed) {
+		if (preg_match('#^https?://[a-zA-Z_0-9-]+.tumblr.com/#i', $feed->url())) {
+			$simplePie->set_useragent(FRESHRSS_USERAGENT . ' like Baiduspider');
+		}
+	}
+}
diff --git a/lib/core-extensions/Tumblr-GDPR/metadata.json b/lib/core-extensions/Tumblr-GDPR/metadata.json
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+{
+	"name": "Tumblr-GDPR",
+	"author": "Alkarex",
+	"description": "Bypass Tumblr’ GPDR check (implying consent) for the European Union",
+	"version": 1.0,
+	"entrypoint": "TumblrGdpr",
+	"type": "system"
+}