Examine source code of C2 Password

{
  "manifest_version": 2,
  "name": "__MSG_extName__",
  "description": "__MSG_extDescription__",
  "version": "2.30.18",
  "icons": {
    "16": "assets/logo_pw_16.png",
    "24": "assets/logo_pw_24.png",
    "48": "assets/logo_pw_48.png",
    "128": "assets/logo_pw_128.png"
  },
  "homepage_url": "https://c2.synology.com/password",
  "default_locale": "en",
  "author": "Synology Inc.",
  "permissions": [
    "activeTab",
    "alarms",
    "clipboardWrite",
    "contextMenus",
    "idle",
    "privacy",
    "scripting",
    "storage",
    "unlimitedStorage",
    "webNavigation",
    "webRequest",
    "webRequestBlocking",
    "<all_urls>"
  ],
  "optional_permissions": [],
  "web_accessible_resources": [
    "auth.html",
    "encryption-key.html",
    "autosave.html",
    "dropdown.html",
    "icon.html"
  ],
  "commands": {
    "_execute_browser_action": {
      "suggested_key": {
        "default": "Ctrl+Shift+Y",
        "linux": "Ctrl+Shift+U"
      }
    },
    "save_login": {
      "suggested_key": {
        "default": "Alt+Shift+E"
      },
      "description": "Save to C2 Password"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "c2password@synology.com"
    }
  },
  "background": {
    "persistent": true,
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_icon": {
      "19": "assets/logo_pw_19.png",
      "38": "assets/logo_pw_38.png"
    },
    "default_title": "Synology C2 Password",
    "default_popup": "popup.html?popup"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "all_frames": true,
      "run_at": "document_start",
      "js": [
        "content-scripts/content-script-trigger.js"
      ]
    },
    {
      "matches": [
        "https://profile.c2.c2go.dev/authenticator-verification",
        "https://profile.c2.synology.com/authenticator-verification",
        "https://profile.c2test.synology.com/authenticator-verification"
      ],
      "run_at": "document_start",
      "js": [
        "content-scripts/content-script-unlock.js"
      ]
    }
  ]
}