diff --git a/README.md b/README.md
index 8bb579a..e51f5a4 100644
--- a/README.md
+++ b/README.md
@@ -1,2 +1,2 @@
-# katoffl
+# Katoffl
 A browser extension that replaces 🇩🇪 with 🥔 on Twitter.
diff --git a/icons/icon128.png b/icons/icon128.png
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diff --git a/icons/icon16.png b/icons/icon16.png
new file mode 100644
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diff --git a/icons/icon48.png b/icons/icon48.png
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diff --git a/icons/icon96.png b/icons/icon96.png
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diff --git a/manifest.json b/manifest.json
new file mode 100644
index 0000000..17717f6
--- /dev/null
+++ b/manifest.json
@@ -0,0 +1,20 @@
+{
+  "manifest_version": 2,
+  "name": "Katoffl",
+  "description": "Replaces 🇩🇪 with 🥔 on Twitter.",
+  "version": "1.0",
+  "icons": {
+    "16": "icons/icon16.png",
+    "48": "icons/icon48.png",
+    "96": "icons/icon96.png",
+    "128": "icons/icon128.png"
+  },
+
+  "content_scripts": [
+    {
+      "matches": ["*://*.twitter.com/*"],
+      "js": ["./substitute.js"],
+      "run_at": "document_end"
+    }
+  ]
+}
diff --git a/substitute.js b/substitute.js
new file mode 100644
index 0000000..b01428a
--- /dev/null
+++ b/substitute.js
@@ -0,0 +1,33 @@
+function replaceSchland (node) {
+  if (node.nodeName === "IMG" && node.classList.contains("Emoji")) {
+    if (node.src.endsWith("/1f1e9-1f1ea.png")) {
+      node.src = node.src.replace("/1f1e9-1f1ea.png", "/1f954.png");
+    }
+  } else if (node.nodeName === "SPAN" && node.classList.contains("Emoji")) {
+    if (node.style.backgroundImage.endsWith("/1f1e9-1f1ea.png\")")) {
+      node.style.backgroundImage = node.style.backgroundImage.replace("/1f1e9-1f1ea.png", "/1f954.png");
+    }
+  } else {
+    for (let i = 0; i < node.childNodes.length; i++) {
+      replaceSchland(node.childNodes[i]);
+    }
+  }
+}
+
+replaceSchland(document.body);
+
+const observer = new MutationObserver((mutations) => {
+  mutations.forEach((mutation) => {
+    if (mutation.addedNodes && mutation.addedNodes.length > 0) {
+      for (let i = 0; i < mutation.addedNodes.length; i++) {
+        const newNode = mutation.addedNodes[i];
+        replaceSchland(newNode);
+      }
+    }
+  });
+});
+
+observer.observe(document.body, {
+  childList: true,
+  subtree: true
+});