Examine source code of ZenBlock: Mindful Web Blocker & Focus Timer

{
  "manifest_version": 2,
  "name": "ZenBlock: Mindful Web Blocker & Focus Timer",
  "description": "Stop wasting time on distracting websites with ZenBlock, a mindful website blocker with 30-sec pause to break distraction habits.",
  "version": "1.0.11",
  "icons": {
    "16": "/icon/16.png",
    "32": "/icon/32.png",
    "48": "/icon/48.png",
    "96": "/icon/96.png",
    "128": "/icon/128.png"
  },
  "permissions": [
    "storage",
    "tabs",
    "alarms",
    "contextMenus",
    "<all_urls>"
  ],
  "content_security_policy": "script-src 'self' 'wasm-unsafe-eval'; object-src 'self'; connect-src 'self' https://*.firebaseapp.com https://*.googleapis.com https://*.dodopayments.com https://identitytoolkit.googleapis.com https://securetoken.googleapis.com;",
  "options_ui": {
    "page": "options.html"
  },
  "externally_connectable": {
    "matches": [
      "https://zen-blocker-prod.web.app/*",
      "https://zen-blocker-prod.firebaseapp.com/*",
      "https://www.zenblock.app/*",
      "http://localhost:*/*"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "zenblock@buildwithnayan.com",
      "data_collection_permissions": {
        "required": [
          "authenticationInfo",
          "personallyIdentifyingInfo",
          "websiteContent"
        ]
      }
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_title": "Default Popup Title",
    "default_popup": "popup.html"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.google.com/*"
      ],
      "js": [
        "content-scripts/content.js"
      ]
    },
    {
      "matches": [
        "http://localhost/*",
        "https://www.zenblock.app/*",
        "https://zen-blocker-prod.firebaseapp.com/*",
        "https://zen-blocker-prod.web.app/*"
      ],
      "js": [
        "content-scripts/sync-injector.js"
      ]
    }
  ]
}