feat: add a browser extensions

extension/firefox/manifest.json

@@ -0,0 +1,30 @@
+{
+  "manifest_version": 2,
+  "version": "1.1",
+  "name": "Watch on Anix",
+  "description": "Adds a button to watch on Anix.",
+  "browser_specific_settings": {
+    "gecko": {
+      "id": "{8c53d0c2-43ad-4498-b700-290bd2e1030f}"
+    }
+  },
+  "content_scripts": [
+    {
+      "matches": [
+        "https://anixart.tv/release/*",
+        "https://anixart.tv/collection/*",
+        "https://anixart.tv/profile/*"
+      ],
+      "js": [
+        "main.js"
+      ]
+    }
+  ],
+  "icons": {
+    "16": "icon-16x16.png",
+    "32": "icon-32x32.png",
+    "48": "icon-48x48.png",
+    "72": "icon-72x72.png",
+    "96": "icon-96x96.png"
+  }
+}