Examine source code of Multi-Site Time Limiter

{
  "manifest_version": 2,
  "name": "Multi-Site Time Limiter with Password",
  "version": "2.0",
  "description": "Limit time on chosen sites, with password protection.",
  "permissions": [
    "tabs",
    "storage",
    "webNavigation",
    "*://*/*"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_icon": "icon.svg"
  },
  "icons": {
    "48": "icon.svg"
  },
  "options_ui": {
    "page": "options.html",
    "open_in_tab": true
  },
  "web_accessible_resources": [
    "blocked.html"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{0290b82f-a55b-4a02-949c-94c29478bc3a}"
    }
  }
}