Examine source code of APK Sheep

{
  "browser_action": {
    "default_popup": "popup.html",
    "default_title": "APK Sheep",
    "default_icon": "icon.png"
  },
  "description": "Download Your Favorite Game Files For Free From The APK Sheep Website.",
  "icons": {
    "128": "icon.png"
  },
  "name": "APK Sheep",
  "version": "1.1",
  "manifest_version": 2,
  "browser_specific_settings": {
    "gecko": {
      "id": "{768f8cce-9b14-43e4-9195-4b7adeb8f001}"
    }
  }
}