Examine source code of Web Clipper

{
  "manifest_version": 2,
  "name": "Web Clipper",
  "version": "1.0",
  "description": "Allows users to clip and save selected web content locally.",
  "icons": {
    "48": "icon.png"
  },
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": "icon.png"
  },
  "permissions": [
    "storage",
    "activeTab"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{e0c5f97b-50d9-4c0e-8b81-876b9395d079}"
    }
  }
}