How many people use their microphone that often? If they don't care about their own privacy over the inconvience of clicking a button then they probably deserve the privacy intrusion they're going to get.
How many people use their microphone that often?
I can think of users of Siri, users of OK Google, users of Cortana, users of voice-to-SMS, frequent users of VoIP, and people who use dictation because they have trouble using a standard keyboard. Someone who scans barcodes of products or scans personal checks from friends and family and payroll checks from employers too small for direct deposit might use the camera often.
I suggest a different privilege model for access to privacy-sensitive sensors:
- Background access (while this origin or this app is open)
- Foreground access (while this origin or this app is open and focused)
- Temporary background access (revoked once all documents from this origin are unloaded, other than in navigation to another same-origin document, or all windows from this app are closed)
- Temporary foreground access (default)
- No access (do not ask user again)