The best alternatives to BrowserHub are Helium, Blurr, and Fluid Browser. If these 3 options don't work for you, we've listed a few more alternatives below.
What do you think of BrowserHub?
Hurree— The smarter, simpler way to analyze your data
Multitask with ease. Helium is a floating browser window that allows you to watch media while you work. Your content will never fall behind your other windows even as you switch tasks.
Blurr is a tool for user anonymity. Blurr works against data collection agencies to anonymize your digital footprint with meaningless browsing history.
Browserosaurus is an open-source (MIT license) browser prompter for macOS. It works by setting itself as the default browser; any clicked links in non-browser apps are now sent to Browserosaurus where it’ll present you with a menu of your installed browsers.