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Every time I start Firefox a warbling siren starts playing. Have to unplug the entire sound system.

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Every time I start Firefox a warbling siren starts playing. Have to unplug the entire sound system. This has just started. Sounds are turned off in Windows.

This happened

Every time Firefox opened

Every time I start Firefox a warbling siren starts playing. Have to unplug the entire sound system. This has just started. Sounds are turned off in Windows. == This happened == Every time Firefox opened

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It's just the Google homepage tribute to Pacman turning 30 today. A playable game starts up automatically, use the arrow keys to move Pacman. It's fun! You can get Ms Pacman to appear in that game by clicking the "insert coin" button twice and using the WASD keys to move :)

You can also just change your homepage to something other than google until tomorrow.