Examine source code of Momentum

{
  "manifest_version": 2,
  "name": "Momentum",
  "short_name": "Momentum",
  "version": "2.26.8",
  "description": "Transform your browser into a beautifully designed tab that helps you feel calm, keep focus, and stay energized.",
  "applications": {
    "gecko": {
      "id": "momentum@momentumdash.com",
      "strict_min_version": "58.0"
    }
  },
  "icons": {
    "32": "img/meta/icon-32.png",
    "128": "img/meta/icon-128.png"
  },
  "background": {
    "scripts": [
      "backgroundScript.js"
    ]
  },
  "content_security_policy": "script-src 'self'; object-src 'self' ",
  "chrome_url_overrides": {
    "newtab": "index.html"
  },
  "browser_action": {
    "default_title": "Momentum",
    "default_icon": {
      "16": "img/meta/icon-16.png",
      "32": "img/meta/icon-32.png"
    }
  },
  "chrome_settings_overrides": {
    "homepage": "index.html"
  },
  "web_accessible_resources": [
    "site-blocker.html"
  ],
  "content_scripts": [
    {
      "matches": [
        "https://*.momentumdash.com/*"
      ],
      "run_at": "document_end",
      "all_frames": true,
      "js": [
        "content-scripts/momoSiteInterop.js"
      ]
    }
  ],
  "permissions": [
    "unlimitedStorage",
    "https://*.momentumdash.com/*",
    "alarms",
    "idle"
  ],
  "optional_permissions": [
    "tabs",
    "sessions",
    "bookmarks",
    "topSites",
    "scripting",
    "*://*/*",
    "notifications",
    "search"
  ]
}