I wish I could use Vivaldi, it seems like a nice browser for power users. Unfortunately it's closed source (besides the Webkit parts). Considering how much sensitive information goes through a browser nowadays, I would never consider something closed source.
I'm sure Vivaldi has no intentions of becoming "evil" like Google, but because of its closed source nature it wouldn't be hard to slip a tracker or two in the browser and regular users would be none the wiser.
I'm sure Vivaldi has no intentions of becoming "evil" like Google, but because of its closed source nature it wouldn't be hard to slip a tracker or two in the browser and regular users would be none the wiser.