Examine source code of Bookmark Manager

{
  "manifest_version": 2,
  "name": "Bookmark Manager",
  "version": "1.0",
  "description": "Bookmark Manager that helps with Organization, Syncing across browsers and platforms.",
  "permissions": [
    "bookmarks",
    "tabs",
    "storage",
    "<all_urls>",
    "declarativeNetRequestWithHostAccess"
  ],
  "browser_action": {
    "default_popup": "popup.html"
  },
  "icons": {
    "48": "icon.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": true
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content_script.js"
      ],
      "run_at": "document_start",
      "all_frames": true
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{cbdb3313-69ca-4e23-9e79-e02faba80b70}"
    }
  }
}