Examine source code of Speakeroo

{
  "description": "Turn Blog posts into podcasts and listen to them on your phone.",
  "version": "0.9.3",
  "name": "Speakeroo",
  "background": {
    "page": "background.html",
    "persistent": false
  },
  "permissions": [
    "identity",
    "tabs",
    "cookies",
    "http://*/*",
    "https://*/*"
  ],
  "key": "MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAkywF0kfMldbKgB3trEm0y8mKys8lzsEdTEeJJxSu7awdGlIdIq/81yMQP04waFGPbLbNlHKPuG6Lh6zZTcQk40WFwkbo1AvWVqhwzjMMmQnJ1QHJcVF9t/RB76/EM0n3e+T6upe2iZU8cWtkLePiTgN2Hrh8SSxszKZTYYqLqZUQLThnzifPxi3w0gWTv1vEEfH8hsz3ESdRpP27ci0Ov1DYenWFz69YFUYObEvDq5/iJ1mtszTB5AO25hH/tJ1mXw+6qu9DpIDQApqktFU7qmggXyXXTQSOTKykzUFiTZX3TflPs5ukdO3MK66MGF2vw991rfoV2GC74EZtDmT1JQIDAQAB",
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": {
      "48": "icon_48.png",
      "128": "icon_128.png"
    },
    "default_title": "Speakeroo"
  },
  "icons": {
    "48": "icon_48.png",
    "128": "icon_128.png"
  },
  "content_scripts": [
    {
      "matches": [
        "http://*/*",
        "https://*/*",
        "<all_urls>"
      ],
      "js": [
        "contentScript.bundle.js"
      ],
      "css": [
        "content.styles.css"
      ]
    }
  ],
  "web_accessible_resources": [
    "content.styles.css"
  ],
  "manifest_version": 2,
  "content_security_policy": "script-src 'self' 'unsafe-eval'; object-src 'self'",
  "applications": {
    "gecko": {
      "id": "dev@speakeroo.app"
    }
  }
}