Examine source code of Raindrop Quick Add

{
  "$schema": "https://www.schemastore.org/webextension.json",
  "manifest_version": 3,
  "name": "__MSG_extensionName__",
  "version": "1.0.4",
  "description": "__MSG_extensionDescription__",
  "author": "Daniel Rozenberg",
  "homepage_url": "https://github.com/danielrozenberg/raindrop-quick-add",
  "icons": {
    "48": "icons/logo.svg",
    "96": "icons/logo.svg"
  },
  "background": {
    "scripts": [
      "background.mjs"
    ],
    "type": "module"
  },
  "commands": {
    "_execute_page_action": {
      "suggested_key": {
        "default": "Alt+R"
      },
      "description": "__MSG_commandDescription__"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "https://firefox.danielrozenberg.com/raindrop-quick-add/*"
      ],
      "js": [
        "authentication-verifier.mjs"
      ],
      "run_at": "document_start"
    }
  ],
  "action": {
    "default_icon": "icons/button-pending.svg",
    "default_title": "__MSG_actionDefaultLabel__"
  },
  "page_action": {
    "default_icon": "icons/button-pending.svg",
    "default_title": "__MSG_pageActionPending__",
    "hide_matches": [
      "*://app.raindrop.io/*"
    ],
    "show_matches": [
      "*://*/*"
    ]
  },
  "options_ui": {
    "page": "options.html"
  },
  "permissions": [
    "alarms",
    "menus",
    "storage",
    "tabs"
  ],
  "host_permissions": [
    "*://*/*"
  ],
  "default_locale": "en",
  "browser_specific_settings": {
    "gecko": {
      "id": "raindrop-quick-add@firefox.danielrozenberg.com",
      "data_collection_permissions": {
        "required": [
          "bookmarksInfo"
        ]
      }
    }
  }
}