Examine source code of Distraction Sentry (Web Blocker)

{
  "_comment_mv3_firefox": [
    "────────────────────────────────────────────────────────────────────────────",
    "manifest.json — Firefox Manifest Version 3",
    "",
    "MANIFEST V3 vs V2 DIFFERENCES (relevant to Firefox):",
    "",
    "  Background scripts:",
    "    MV2  → `background.scripts` (persistent by default)",
    "    Chrome MV3 → `background.service_worker` (non-persistent, no DOM)",
    "    Firefox MV3 → `background.scripts` (still persistent background pages!)",
    "",
    "  Firefox does NOT yet support `service_worker` in MV3 manifests.",
    "  Using `background.scripts` keeps a long-lived background page alive,",
    "  which gives us full access to the DOM, WebExtension APIs, and avoids",
    "  the 30-second idle termination that affects Chrome service workers.",
    "",
    "  Web Request blocking:",
    "    MV2  → `webRequest` + `webRequestBlocking` (synchronous blocking)",
    "    Chrome MV3 → `declarativeNetRequest` (static rule-based only)",
    "    Firefox MV3 → Both `webRequest` and `declarativeNetRequest` are",
    "                  available; `webRequest` blocking is still supported,",
    "                  making Firefox MV3 more capable for content blockers.",
    "────────────────────────────────────────────────────────────────────────────"
  ],
  "manifest_version": 3,
  "name": "Distraction Sentry (Website Blocker)",
  "version": "0.1.0",
  "description": "Your arcane guardian against digital distractions.",
  "browser_specific_settings": {
    "gecko": {
      "id": "distraction-sentry-website-blocker@your-domain.com",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "icons": {
    "48": "icons/icon48.png",
    "96": "icons/icon96.png"
  },
  "action": {
    "default_popup": "index.html",
    "default_icon": {
      "48": "icons/icon48.png"
    },
    "default_title": "Distraction Sentry"
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "type": "module"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_start"
    }
  ],
  "permissions": [
    "storage",
    "tabs",
    "webRequest",
    "webRequestBlocking",
    "declarativeNetRequest",
    "declarativeNetRequestWithHostAccess"
  ],
  "host_permissions": [
    "<all_urls>"
  ],
  "web_accessible_resources": [
    {
      "resources": [
        "icons/*",
        "blocked.html"
      ],
      "matches": [
        "<all_urls>"
      ]
    }
  ]
}