LibreWolf is a pretty good firefox fork, But i would always use firefox with tweaks and user.js. Don't trust forks much, As i rather put my data with firefox plus mullvad vpn works with them on their vpn service. And mullvad is a really good privacy vpn...
I recommend a secure home server, People home servers something are not reliable or secure. Got to find a home server to use and sign up to. I would recommend using kde.org, As it is 100% reliable and secure. Others may very.
Use as much open source applications as possible, And if you want to. Do not force anyone to use them, Just be smart in providing your information.
I use:
Matrix - It's end to end encrypted but some groups i am in, The owners have it disabled for some reason.
Keybase - Keybase was sold, But still end to end encrypted. Plus i was using it before they got sold so.
Telegram - Telegram is not end to end encrypted by default, Unless you enable secret chats.