If you want it the safest use the official Monero wallet. Or what I use and trust cakewallet. It can also do bitcoin in case you use that too…

Yes for the browser i agree, sadly apps have trackers and ads too. A dns can be useful if it’s system wide for all that stuff. Nextdns, adguard, rethinkdns or decloudus comes to mind

Jitsi, perhaps matrix (element), signal (has tell number) works too. Threema also added video into it… and an unpopular one brave (has it without signing in, within the browser)