Examine source code of Opaque-tts

{
  "manifest_version": 2,
  "name": "Opaque",
  "version": "1.0",
  "description": "Save and listen to Medium articles offline with audio support.",
  "icons": {
    "48": "icons/icon48.png"
  },
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": "icons/icon48.png"
  },
  "permissions": [
    "activeTab",
    "storage",
    "tabs",
    "https://medium.com/*"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "web_accessible_resources": [
    "view.html"
  ],
  "content_scripts": [
    {
      "matches": [
        "https://medium.com/*"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{e72a9cde-a4ff-4552-a9d5-7d5dd1154b29}"
    }
  }
}