Examine source code of Daily Color

{
  "manifest_version": 2,
  "version": "0.0.1",
  "name": "__MSG_name__",
  "description": "__MSG_description__",
  "default_locale": "en",
  "icons": {
    "128": "icon.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "strict_min_version": "67.0"
    }
  },
  "permissions": [
    "theme",
    "alarms"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  }
}