Examine source code of Coin Dog

{
  "manifest_version": 2,
  "name": "Coin Dog",
  "version": "0.2.2",
  "description": "Coin Dog fetches your crypto prices right on your browser. Check prices, calculate rates and more!",
  "browser_specific_settings": {
    "gecko": {
      "id": "firefox@coindog",
      "strict_min_version": "57.0"
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_icon": {
      "16": "icon16.png",
      "48": "icon48.png",
      "96": "icon96.png",
      "128": "icon128.png"
    },
    "default_title": "Coin Dog",
    "default_popup": "popup.html"
  },
  "page_action": {
    "default_icon": {
      "19": "icon19.png",
      "38": "icon38.png"
    },
    "default_title": "Coin Dog",
    "default_popup": "home.html"
  },
  "icons": {
    "16": "icon16.png",
    "48": "icon48.png",
    "96": "icon96.png",
    "128": "icon128.png"
  },
  "permissions": [
    "storage"
  ]
}