Examine source code of Startup Theme Changer

{
  "manifest_version": 2,
  "name": "__MSG_extensionName__",
  "description": "__MSG_extensionDescription__",
  "version": "2.0.1",
  "author": "Wip!",
  "browser_specific_settings": {
    "gecko": {
      "id": "{60B74960-90D3-11E7-81FA-1478B27A84CF}",
      "strict_min_version": "62.0"
    }
  },
  "permissions": [
    "management",
    "storage"
  ],
  "default_locale": "en",
  "icons": {
    "48": "flip-to-front.svg",
    "96": "flip-to-front.svg"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "options_ui": {
    "page": "options.html",
    "browser_style": true,
    "open_in_tab": false
  },
  "commands": {
    "change-theme": {
      "suggested_key": {
        "default": "Ctrl+Alt+T"
      },
      "description": "__MSG_commandChangeThemeDescription__"
    }
  }
}