I don't know why but today vivaldi started making clicky sounds every time a page loads. Sounds just like the ones internet explorer used to make way back when. Its kinda like a leaky tap, annoying as hell!
I was having that problem, thought it was Vivaldi… Until it started happening when other browsers were focused too.
Turned out to be the "get your free windows 10" toolbar crap M$ went and shoved down most people's throats. Killed the process for that, end of problem.