I have a vision of folks going to great extent to install a 'privacy based browser' to then go on facebook an share their personal info to the world.
Seriously though, it's a spectrum. And there are always going to be tradeoffs, especially when there are 2 sides to the communication, like email with family who use gmail / outlook etc.
Mostly, privacy is an illusion. We worry about our browsers, but carry our phones with GPS enabled. And facebook installed. And app xyz, which all know where we are. And walk into stores with our Wifi enabled so they can (if they want) track and register your MAC address. Or your BT.
In the end, it's a constant arms race between the people that want to track you and have huge budgets, and folks who'd prefer not to be tracked but have to rely on others to help them do so.
You can make marginal improvements, but in a connected world, you leave traces. That's the way it works.
Good reading is what the journalists went through who got Snowden's files. They used air-gapped, mall purchased computers that they paid for in cash.
Having said that, I do:
- Pick a browser, then try to remove all the settings that I find in appropriate
- Run uBlock and a few other extensions (of course, more extensions = more accurate fingerprinting, so it's a tradeoff)
- Use Signal (or Session / Element)
- Run duckduckgo's browser on my phone with the new tracking-blocker (very interesting results, did you know that your outlook app reports to facebook?)
- Use protonmail / tutanota / my own domain on zoho infrastructure, based on what I need
- Split my email addresses depending on the usecase, after all, why make it easy for sites to compile your profile
- VPN out for many activities (which just shifts the group I need to trust, from my ISP to my VPN provider)
- Use FreeTube instead of youtube (at times, frankly at some point it just becomes a hassle)
- I don't have "smart" lights, or TV, or Alexa or google nest ... etc etc (substitute the word 'surveillance' for any 'smart' device and you're probably right on the money)
- block roku etc via pihole / adblock
- ...
But I have no illusions, and at best I'm making marginal differences. I've been in IT (and at times Security IT) for 20+ years.
There's only so far you can go before you swear off all technology, move into the mountains and become a hermit.
Ultimately, the only thing that will make a difference long are better, audited and enforceable regulations on what companies can track, store and use to ID and target you.
Yikes that got way too long.