Examine source code of Web Clippers

{
  "manifest_version": 2,
  "name": "Web Clipper",
  "version": "1.0",
  "description": "Save and organize web content directly from your browser.",
  "icons": {
    "48": "icon.png"
  },
  "permissions": [
    "activeTab",
    "storage",
    "contextMenus"
  ],
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": "icon.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{0397f392-78b3-48cd-a956-5e26bb699f35}"
    }
  }
}