Examine source code of Learnmatch Web Dictionary

{
  "manifest_version": 2,
  "name": "Learnmatch Web Dictionary",
  "description": "Lookup any word from any page. Learnmatch.",
  "version": "1.0.1resigned1",
  "icons": {
    "16": "favicon.png",
    "48": "favicon.png",
    "128": "favicon.png"
  },
  "permissions": [
    "activeTab",
    "https://www.learnmatchdict.com//#"
  ],
  "browser_action": {
    "default_icon": "favicon.png",
    "default_popup": "popup.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{24861979-a199-4fd5-81a9-6a6c2b3f60f8}"
    }
  }
}