Examine source code of CoScreen

{
  "name": "CoScreen",
  "version": "0.0.7",
  "manifest_version": 2,
  "description": "CoScreen",
  "homepage_url": "https://coscreen.co",
  "icons": {
    "16": "icons/16.png",
    "19": "icons/19.png",
    "48": "icons/48.png",
    "128": "icons/128.png"
  },
  "default_locale": "en",
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": true
  },
  "permissions": [
    "storage"
  ],
  "omnibox": {
    "keyword": "coscreen"
  },
  "browser_action": {
    "default_popup": "browser-extension.html"
  },
  "content_scripts": [
    {
      "matches": [
        "https://calendar.google.com/calendar/*"
      ],
      "js": [
        "googleCalendar.js"
      ]
    }
  ],
  "web_accessible_resources": [
    "icons/19.png"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{6a034035-aae7-442d-87b5-35af3dc46ef0}"
    }
  }
}