Firefox: if a site's audio can't be captured (only silence for 8 seconds), a hint now suggests "This tab + my microphone" or Chrome/Edge, and captions stop automatically after 20 more seconds of silence. When a no-sound hint shows, the extension reports it once (player type, and the site's domain name only with the optional browsing-activity permission) so we can fix capture problems.

Stopping no longer loses the last sentence: the extension keeps the connection open until the final caption and its translation arrive (at most 9 seconds).
If a tab is muted or silent for 8 seconds before any caption appears, a hint now suggests playing or unmuting it, or switching to the microphone (12 languages).
Small connection diagnostics: the audio source, browser and extension version are sent when a session starts.