Examine source code of Billy — Subscription sync

{
  "manifest_version": 3,
  "name": "Billy — Subscription sync",
  "short_name": "Billy",
  "description": "Sync your active subscriptions into Billy to track upcoming charges and recurring spend in one place.",
  "version": "1.0.55",
  "permissions": [
    "storage"
  ],
  "host_permissions": [
    "https://www.amazon.com/*",
    "https://www.netflix.com/*",
    "https://tv.youtube.com/*",
    "https://account.apple.com/*",
    "https://www.icloud.com/*",
    "https://apps.apple.com/includes/commerce/subscriptions*",
    "https://www.costco.com/*",
    "https://www.doordash.com/*",
    "https://claude.ai/*",
    "https://ultimaterewardspoints.chase.com/*",
    "https://www.hungryroot.com/*",
    "https://api.billy.vocollc.net/*"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "type": "module"
  },
  "action": {
    "default_popup": "popup.html",
    "default_title": "Billy",
    "default_icon": {
      "16": "icons/icon-16.png",
      "32": "icons/icon-32.png",
      "48": "icons/icon-48.png",
      "128": "icons/icon-128.png"
    }
  },
  "icons": {
    "16": "icons/icon-16.png",
    "32": "icons/icon-32.png",
    "48": "icons/icon-48.png",
    "128": "icons/icon-128.png"
  },
  "content_scripts": [
    {
      "matches": [
        "https://www.amazon.com/gp/subscribe-and-save/*"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_idle"
    },
    {
      "matches": [
        "https://www.amazon.com/hz5/yourmembershipsandsubscriptions*"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_idle"
    },
    {
      "matches": [
        "https://www.netflix.com/*"
      ],
      "js": [
        "netflix-content.js"
      ],
      "run_at": "document_idle"
    },
    {
      "matches": [
        "https://tv.youtube.com/*"
      ],
      "js": [
        "youtube-tv-content.js"
      ],
      "run_at": "document_idle"
    },
    {
      "matches": [
        "https://account.apple.com/*",
        "https://www.icloud.com/*"
      ],
      "js": [
        "apple-content.js"
      ],
      "run_at": "document_idle"
    },
    {
      "matches": [
        "https://apps.apple.com/includes/commerce/subscriptions*"
      ],
      "js": [
        "apple-content.js"
      ],
      "all_frames": true,
      "run_at": "document_idle"
    },
    {
      "matches": [
        "https://www.costco.com/RenewMembershipView*"
      ],
      "js": [
        "costco-content.js"
      ],
      "run_at": "document_idle"
    },
    {
      "matches": [
        "https://www.doordash.com/manage-subscription*"
      ],
      "js": [
        "doordash-content.js"
      ],
      "run_at": "document_idle"
    },
    {
      "matches": [
        "https://claude.ai/settings/billing*"
      ],
      "js": [
        "claude-content.js"
      ],
      "run_at": "document_idle"
    },
    {
      "matches": [
        "https://ultimaterewardspoints.chase.com/rewards-activity*"
      ],
      "js": [
        "chase-content.js"
      ],
      "run_at": "document_idle"
    },
    {
      "matches": [
        "https://www.hungryroot.com/*"
      ],
      "js": [
        "hungryroot-content.js"
      ],
      "run_at": "document_idle"
    },
    {
      "matches": [
        "https://billy.vocollc.net/*"
      ],
      "js": [
        "billy-bridge.js"
      ],
      "run_at": "document_start"
    }
  ],
  "content_security_policy": {
    "extension_pages": "script-src 'self'; style-src 'self' 'unsafe-inline'; object-src 'none'; base-uri 'none'"
  },
  "web_accessible_resources": [
    {
      "resources": [
        "icons/*.png"
      ],
      "matches": [
        "https://www.amazon.com/*",
        "https://www.netflix.com/*",
        "https://tv.youtube.com/*",
        "https://account.apple.com/*",
        "https://www.icloud.com/*",
        "https://www.costco.com/*",
        "https://www.doordash.com/*",
        "https://claude.ai/*",
        "https://ultimaterewardspoints.chase.com/*",
        "https://www.hungryroot.com/*"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "billy-sync@vocollc.net",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "websiteContent"
        ]
      }
    },
    "gecko_android": {
      "strict_min_version": "142.0"
    }
  }
}