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FF 54.0.1 iMac Yosemite 10.10.5 -- When start firefox it starst a beeping sound like a smoke alarm. Completely quit does it stop. Restart no more beeping

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FF 54.0.1 iMac Yosemite 10.10.5 -- When start firefox it starst a beeping sound like a smoke alarm. Completely quit does it stop. Restart no more beeping.

I does this on both my IMacs, My Mac Pro has an older version 48.0.2 of FF and is not effected.

FF 54.0.1 iMac Yosemite 10.10.5 -- When start firefox it starst a beeping sound like a smoke alarm. Completely quit does it stop. Restart no more beeping. I does this on both my IMacs, My Mac Pro has an older version 48.0.2 of FF and is not effected.

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hello, can you try to replicate this behaviour when you launch firefox in safe mode once? if not, maybe an addon is interfering here...

Troubleshoot extensions, themes and hardware acceleration issues to solve common Firefox problems