Examine source code of Don't Procrastinate

{
  "manifest_version": 3,
  "name": "Don't Procrastinate",
  "version": "0.2.0",
  "description": "Adds a confirmation step before opening distracting websites.",
  "browser_specific_settings": {
    "gecko": {
      "id": "{7474b3b1-2d7c-4d74-b8a4-22600c3daf78}",
      "strict_min_version": "142.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "permissions": [
    "storage",
    "tabs",
    "webRequest",
    "webRequestBlocking",
    "webNavigation",
    "notifications"
  ],
  "host_permissions": [
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "quotes.js",
      "background.js"
    ]
  },
  "action": {
    "default_popup": "popup/popup.html",
    "default_icon": {
      "16": "icons/icon.svg",
      "32": "icons/icon.svg",
      "48": "icons/icon.svg"
    },
    "default_title": "Don't Procrastinate"
  },
  "icons": {
    "48": "icons/icon.svg",
    "96": "icons/icon.svg"
  },
  "options_ui": {
    "page": "settings/settings.html",
    "open_in_tab": true
  },
  "web_accessible_resources": [
    {
      "resources": [
        "intercept/intercept.html"
      ],
      "matches": [
        "<all_urls>"
      ]
    }
  ]
}