Examine source code of Easy Link Extractor

{
  "manifest_version": 2,
  "name": "Link Extractor",
  "version": "1.0",
  "description": "Findet alle Links mit einer bestimmten URL auf der aktuellen Seite.",
  "permissions": [
    "activeTab",
    "storage"
  ],
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": {
      "16": "icon16x16.png",
      "48": "icon48x48.png",
      "128": "icon128x128.png"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{16fcf5ce-c18c-4831-805b-0301bcaf1485}"
    }
  }
}