Examine source code of ChoiceCheapies

{
  "manifest_version": 2,
  "name": "ChoiceCheapies",
  "version": "1.2.0",
  "description": "Summarised deals, coupons and cashbacks from ChoiceCheapies",
  "icons": {
    "16": "choicecheapies/16.png",
    "32": "choicecheapies/32.png",
    "48": "choicecheapies/48.png",
    "128": "choicecheapies/128.png"
  },
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": {
      "16": "choicecheapies/16.png",
      "32": "choicecheapies/32.png",
      "48": "choicecheapies/48.png",
      "128": "choicecheapies/128.png"
    }
  },
  "commands": {
    "_execute_browser_action": {
      "suggested_key": {
        "default": "Alt+Shift+O"
      }
    }
  },
  "permissions": [
    "activeTab",
    "https://www.cheapies.nz/"
  ]
}