Examine source code of Day One

{
  "manifest_version": 3,
  "name": "Day One",
  "version": "1.3.5",
  "description": "Save to Day One",
  "browser_specific_settings": {
    "gecko": {
      "id": "{e7c96f5f-5cef-47e5-a1c9-705c1048e5f7}"
    }
  },
  "content_security_policy": {
    "extension_pages": "script-src 'self' 'wasm-unsafe-eval';"
  },
  "permissions": [
    "activeTab",
    "storage",
    "tabs",
    "scripting",
    "contextMenus",
    "webNavigation",
    "webRequest",
    "webRequestBlocking"
  ],
  "host_permissions": [
    "https://dayone.me/api/*",
    "https://chocolate-prod.s3.amazonaws.com/*",
    "https://chocolate-prod.s3.us-east-1.amazonaws.com/*"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "action": {
    "default_popup": "index.html"
  },
  "icons": {
    "128": "icon-128.png"
  },
  "options_ui": {
    "page": "options.html"
  }
}