Examine source code of Surf Clock

{
  "manifest_version": 2,
  "name": "Surf Clock",
  "version": "1.0.5resigned1",
  "author": "crococoding",
  "homepage_url": "https://surfclock.io",
  "description": "Keep track of the time you spend surfing on the web.",
  "icons": {
    "128": "chrome/icon_128.png"
  },
  "browser_action": {
    "default_icon": "chrome/icon_128.png",
    "default_popup": "chrome/popup_chrome.html"
  },
  "permissions": [
    "tabs",
    "storage",
    "https://www.google.com/*"
  ],
  "background": {
    "scripts": [
      "core/background/dexie.js",
      "core/background/vibrant.js",
      "core/background/database.js",
      "core/background/logger.js",
      "chrome/background_chrome.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{22101ec5-d240-43a3-8905-3df66eadbd1d}"
    }
  }
}