Firefox with the "Multi-Account Containers" add-on is pretty great for managing multiple identities. Browser tabs get labels (with color-coded stripes) for whic

Firefox with the "Multi-Account Containers" add-on is pretty great for managing multiple identities. Browser tabs get labels (with color-coded stripes) for which container they belong to. I can ignore identity switchers provided by a site (google in this case) and just keep two gmail tabs, one for personal and one for work, open right next to one another. Firefox keeps each one sandboxed with its own session info like cookies etc.