The Zen Browser is a Firefox-based alternative to [[Arc]]. Arc was simply too buggy on Windows and the Browser Company stopped supporting it, meaning it was never going to fully work. The two primary downsides to the Zen Browser are the lack of folders for favorite links and the wonkiness of maintaining workspaces with different accounts. To set up a workspace for an alternative account (e.g., school or work account), first create a workspace, then right-click the workspace header in the left sidebar and assign it to a one of the pre-defined Firefox "containers" (or create your own). It's just not as intuitive as Arc and the documentation is quite confusing.