content: Requesting help to test something concerning gmail (Strange sound?) Alright guys, this one is simple to test for anyone still using gmail and have a tab permanently open for it. Basically, up your volume and navigate several tabs. The Gmail tab will create this strange noise that I can't replicate on any other website. (Like high pitch static sound) Just in case, you'll probably need good headphones. I remember reading a weird tracking feature that worked with hidden sound reproduction... but no idea if this could be it.