If you’re switching to #Firefox, remember Firefox is not private by default. Consider the #LibreWolf fork, which is. Otherwise, go into your settings and adjust its tracking features (like having #Google as the default search engine), turn off telemetry, “experiments”, etc.
(Also, if you all switch and Google goes bankrupt, #Mozilla will go bankrupt too because they exist thanks to half a billion dollars a year from Google. So remember Google must survive for Mozilla to survive.)