Examine source code of Focus Mode

{
  "manifest_version": 2,
  "name": "Focus Mode",
  "version": "1.0.0",
  "description": "Block distracting websites and manage focus sessions in a dynamic prism-grid layout.",
  "permissions": [
    "webRequest",
    "webRequestBlocking",
    "tabs",
    "storage",
    "clipboardWrite"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": true
  },
  "browser_action": {
    "default_popup": "popup.html",
    "default_title": "Focus Mode"
  },
  "icons": {
    "48": "icon.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{f694ca81-1d3b-4cb8-abe8-c6e62784381c}"
    }
  }
}