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Audio cuts in temporarily when scrubbing HTML video timeline with arrow keys, when macOS is globally muted

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davegrant85
davegrant85
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Recently switched from Chrome to FF on macOS. Running latest Sequoia 15.3.2, Firefox 136.0.2 (aarch64) on a Macbook Air M4.

Problem: When watching a video eg YouTube but including other HTML video, on Firefox where macOS is globally muted and scrubbing through the timeline using the arrow keys, or starting a video mid-way, the audio briefly cuts in (less than a second) and quickly mutes again. I was surprised by this as I expected with macOS globally muted, no application would be able to make any sound.

This behaviour is limited to Firefox and persists with all extensions disabled. macOS is stock with Sound output set to the built-in Macbook Air speakers. No other sound drivers e.g. Soundsource or a USB audio interface have been installed. The laptop itself is brand new and stock.

Can anyone explain why this might be happening?

Recently switched from Chrome to FF on macOS. Running latest Sequoia 15.3.2, Firefox 136.0.2 (aarch64) on a Macbook Air M4. Problem: When watching a video eg YouTube but including other HTML video, on Firefox where macOS is globally muted and scrubbing through the timeline using the arrow keys, or starting a video mid-way, the audio briefly cuts in (less than a second) and quickly mutes again. I was surprised by this as I expected with macOS globally muted, no application would be able to make any sound. This behaviour is limited to Firefox and persists with all extensions disabled. macOS is stock with Sound output set to the built-in Macbook Air speakers. No other sound drivers e.g. Soundsource or a USB audio interface have been installed. The laptop itself is brand new and stock. Can anyone explain why this might be happening?

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