Examine source code of WideWizard

{
  "name": "WideWizard",
  "description": "Use magic to quickly self-publish your books across all platforms.",
  "version": "0.0.9",
  "manifest_version": 2,
  "icons": {
    "16": "icons/icon16x16.png",
    "48": "icons/icon48x48.png",
    "128": "icons/icon128x128.png"
  },
  "browser_action": {
    "default_title": "WideWizard"
  },
  "background": {
    "scripts": [
      "www/js/bex-background.js",
      "js/background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "https://kdp.amazon.com/en_US/title-setup*",
        "https://www.smashwords.com/upload*",
        "https://play.google.com/books/publish*",
        "https://press.barnesandnoble.com/*",
        "https://www.draft2digital.com/book/*",
        "https://www.goodreads.com/book/new*",
        "https://booksprout.co/publisher/book/create*",
        "https://booksprout.co/publisher/book/update*",
        "https://writinglife.kobo.com/ebooks*"
      ],
      "js": [
        "www/js/bex-content-script.js",
        "js/content-script.js"
      ],
      "css": [
        "css/content-css.css"
      ]
    }
  ],
  "permissions": [
    "https://kdp.amazon.com/en_US/title-setup*",
    "https://www.smashwords.com/upload*",
    "https://play.google.com/books/publish*",
    "https://press.barnesandnoble.com/*",
    "https://www.draft2digital.com/book/e/*",
    "https://www.goodreads.com/book/new*",
    "https://booksprout.co/publisher/book/create*",
    "https://writinglife.kobo.com/ebooks*",
    "storage",
    "tabs",
    "unlimitedStorage",
    "contextMenus"
  ],
  "web_accessible_resources": [
    "www/*",
    "js/*",
    "css/*",
    "icons/*",
    "<all_urls>",
    "www/bex-*.js"
  ],
  "content_security_policy": "script-src 'self' 'unsafe-eval' https://127.0.0.1; object-src 'self'",
  "browser_specific_settings": {
    "gecko": {
      "id": "{dd728d4e-fbb0-4fdf-a1a6-1407877e8848}"
    }
  }
}