IT professional here, Mozilla is ideal because it will work with most sites, especially work stuff. Some cloud applications will force you to use either Chrome or the new Edge which has a back end Chromium engine.
Mozilla encrypts DNS traffic with HTTPS which helps obscure your web traffic from ISP's that are used for marketing reasons.
When I need to do something I really don't want people to know about I use TOR which runs Mozilla but uses a proxy redirect. It will make you look like you are coming from another country. Down side is when you search for stuff it is liable to come up in German or French.
As far as search engines go I use DDG for my personal but do still use google for work simply because it is a better search engine.
Defend yourself against tracking and surveillance. Circumvent censorship.