This add-on helps users detect, play, and download Instagram DM voice messages.
How to test:

Open Instagram Direct in Firefox and open a chat with a voice message.
Open the extension popup.
Use Play/Download on the detected voice message.
Permissions used:

downloads: save selected voice files locally.
host permissions for Instagram/CDN domains: access voice media URLs required for core functionality.
The add-on does not collect or transmit personal user data outside the browser.