Unless you want to support George Soros and his agenda. Mozilla has just made a deal with Soros to fight "Fake News". Who defines what "Fake News" are? Soros and other disguised fascists (neoliberals). 1984 is a few decades late, but now its here.
People are mentioning Palemoon or Waterfox, but those still use the Firefox code.
Chrome is also an option, but Google has a similar agenda, as we all have learned the last few weeks.
Email client is a bit harder. I am still trying to find an alternative.