@ejaculator it was steam inventory helper extention
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RE: [Solved]Opera making notification sound even when browser sounds are disabledOpera GX
[Solved]Opera making notification sound even when browser sounds are disabledOpera GX
You can hear the sound played here.
I have browser sounds disabled, all the sidebar apps disabled.
I am using these extensions:
Grammar and Spell Checker
Steam Inventory Helper
Enhancer for YouTube
The sound seems to play randomly but its min 5 minutes for an other sound.