Examine source code of TitlePage Express

{
  "manifest_version": 2,
  "name": "TitlePage Express",
  "description": "The TitlePage Express browser extension finds ISBNs while you browse the internet, providing quick access to TitlePage metadata.",
  "version": "1.0.0",
  "background": {
    "scripts": [
      "js/background.js"
    ],
    "persistent": false
  },
  "icons": {
    "16": "./icon.png",
    "32": "./icon.png",
    "64": "./icon.png",
    "128": "./icon.png"
  },
  "browser_action": {
    "default_popup": "popup.html"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "js/content.js"
      ]
    }
  ],
  "web_accessible_resources": [
    "css/content.css",
    "logo.png",
    "icon.png"
  ],
  "permissions": [
    "storage",
    "contextMenus",
    "<all_urls>"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{bd7510d9-d72f-48ce-8055-cef93eb1c3e9}"
    }
  }
}