Examine source code of Task Haven

{
  "manifest_version": 2,
  "name": "Task Haven",
  "version": "1.0.0",
  "description": "A safe haven for focused work: block distracting sites during focus sessions with a timer and simple controls.",
  "permissions": [
    "storage",
    "tabs",
    "alarms",
    "webRequest",
    "webRequestBlocking",
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "browser_action": {
    "default_title": "Task Haven",
    "default_popup": "popup.html",
    "default_icon": {
      "48": "icons/icon48.png",
      "128": "icons/icon128.png"
    }
  },
  "icons": {
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "web_accessible_resources": [
    "blocked.html",
    "blocked.js"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "task-haven@example.com",
      "strict_min_version": "91.0"
    }
  },
  "options_ui": {
    "page": "options.html",
    "open_in_tab": false
  }
}