Wavebox

If you use web apps and multiple accounts, Wavebox handles these better than any browser I've tried. Customizability is higher than any I've tried, letting you design your workflow with amazing granularity. It also allows you create siloed cookie buckets, to keep workspace info separate. It's the only browser that has let me keep three separate Gmail accounts as there own icons and workspaces on the side app panel. That alone was a hugely useful feature that has made Wavebox my first choice for a productivity browser.