The flagged link is a local address for a self-hosted voice tool running on the same machine, which is exactly what this extension is meant to connect to.
Technical evidence
Scanner reason: JavaScript analysis matched static JavaScript security signal javascript.xray.shady-link. The match applies to this repository.
Contextual assessment: The scanner flagged the fixed URL literal at line 35 (provider_endpoint default). This is a localhost endpoint for a self-hosted TTS service. All network calls use this user-configurable endpoint and target only the Voicebox REST API (/profiles, /generate, /status, /audio). No credentials, API keys, or private content are sent anywhere beyond the user's own configured TTS endpoint. This matches the stated project purpose.