Examine source code of ReadBionic

{
  "manifest_version": 2,
  "name": "ReadBionic",
  "version": "0.1",
  "description": "Bold the first half of every word on a webpage.",
  "icons": {
    "48": "icon.png"
  },
  "permissions": [
    "notifications",
    "activeTab",
    "storage"
  ],
  "browser_action": {
    "default_icon": "icon.png",
    "default_title": "ReadBionic"
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "content_scripts": [
    {
      "matches": [
        "*://*/*"
      ],
      "js": [
        "content_script.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{45754526-4457-451b-ae85-98e123f64c0e}"
    }
  }
}