Add extension files

README.md

@@ -1,2 +1,2 @@
-# katoffl
+# Katoffl
 A browser extension that replaces 🇩🇪 with 🥔 on Twitter.

manifest.json

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+{
+  "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"
+    }
+  ]
+}

substitute.js

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+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
+});