Examine source code of Minimal Blocker

{
  "manifest_version": 2,
  "name": "Minimal Blocker",
  "version": "1.0",
  "description": "Block websites by date range and license key validation.",
  "permissions": [
    "storage",
    "tabs",
    "webRequest",
    "webRequestBlocking",
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "browser_action": {
    "default_icon": {
      "16": "icons/icons8-16.png",
      "48": "icons/icons8-48.png",
      "128": "icons/icons8-128.png"
    },
    "default_title": "Minimal Blocker"
  },
  "icons": {
    "16": "icons/icons8-16.png",
    "48": "icons/icons8-48.png",
    "128": "icons/icons8-128.png"
  },
  "options_ui": {
    "page": "options.html",
    "open_in_tab": true,
    "browser_style": true
  },
  "web_accessible_resources": [
    "blocked.html",
    "blocked.css"
  ],
  "homepage_url": "https://astisoft.net",
  "support_url": "https://astisoft.net/support.html",
  "browser_specific_settings": {
    "gecko": {
      "id": "minimalblocker@astisoft.net",
      "strict_min_version": "109.0"
    }
  }
}