Examine source code of SpaceX Next

{
  "manifest_version": 2,
  "name": "SpaceX Next",
  "version": "1.1resigned1",
  "author": "Joas Onvlee",
  "description": "A web extension displaying data about the next SpaceX launch.",
  "homepage_url": "https://github.com/joasonvlee/spacex-next",
  "icons": {
    "32": "img/logo-32.png"
  },
  "permissions": [
    "activeTab"
  ],
  "browser_action": {
    "default_icon": "img/logo-32.png",
    "default_title": "SpaceX Next",
    "default_popup": "spacexnext.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{f796d823-b2cf-47bc-a3a8-89bdaab83fc7}"
    }
  }
}