Examine source code of Site Limiter

{
  "manifest_version": 2,
  "name": "Site Limiter",
  "version": "1.0",
  "description": "Limits time spent on specific websites.",
  "permissions": [
    "<all_urls>",
    "tabs",
    "activeTab",
    "storage",
    "webNavigation"
  ],
  "background": {
    "page": "src/background/background.html"
  },
  "browser_action": {
    "default_popup": "src/main-ui/popup.html",
    "default_icon": {
      "16": "icons/base-icon.svg",
      "48": "icons/base-icon.svg",
      "128": "icons/base-icon.svg"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "kiranadh1452@gmail.com"
    }
  },
  "icons": {
    "16": "icons/base-icon.svg",
    "48": "icons/base-icon.svg",
    "128": "icons/base-icon.svg"
  }
}