I am using Firefox 74.0 (64-bit).

ADD-ons

Disconnect
Privacy Badger
Ublock Origin

Is this enough ?

I don't use Facebook or Google/Gmail. I use ProtonMail.

I use DuckDuckGo for searching.

What measures do you take to stop being tracked online ?

You're asking the wrong question, out of 2 reasons:

• It’s up to you to also behave securely when browsing - your question implies that once certain measures are in place you can splash around to your heart’s content, but that is never so.
• Absolute zero tracking is impossible, and also not required IMHO.

My opinion is that

• my IP address is out there. I’m usually OK with that. The few cases I’m not, I use Tor-Browser (and that’s a whole different story).
• cookies should not be allowed unless necessary (e.g. logging in), and deleted the moment they're not needed anymore.
• 99% of malware danger comes from javascript. Javascript should be disabled by default.
• Ads are evil, not only becasue of tracking but also because they eat my brain’s AND my machine’s resources. Fortunately domain-based ad and malware blocking is easy. I do it system wide via /etc/hosts

Browser: Firefox
Relevant addons: HTTPS Everywhere, uMatrix, LocalCDN.

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By using addons, you give them access to (everything) you do online.

Who to trust ...

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I trust in audited FOSS. That goes for the addons I use, too.

@ondoho

I used to use Noscript but that by default broke most pages.
What do you recommend ?

If it really broke "most" pages your brwosing habits are very different from mine.
But essentially yes, you have to selectively & sparingly enable just enough javascript to get a usable web page. You only need to do this once - noscript will remember it for subsequent visits. It doesn't take long and you have your old UX back, because most of us browse only a few sites.

It's the old moral about security and convenience being on opposing ends of a scale. You have to adjust that scale the way you want it.

uMatrix works the same way but is much more powerful than noscript:

@ondoho
I have added uMatrix. Will report back. Thanks

My installed addons (please see attachment)

Attached Thumbnails

 

What measures do you (I) take to stop being tracked online ?

read a book.

I unplug the wires, them little buggers can craw through the wires to get into the system so they can send back messages and copies of information I have in it to the overloard, but they cannot craw through the airwaves. So I use wifi instead.

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No mention yet of Decentraleyes, which replaces CDN requests for common libraries with local requests (so it also reduces bandwidth and improves performance).

Otherwise, uBlock Origin, uMatrix, and Privacy Badger, inside the telemetry-free Firefox fork, Waterfox.

I don't, I just stop adverts using up my resources, (uBlock Origin).

If you don't want to be tracked, don't go online.

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Everything you do online leads back to your IP address.

If you want to remain anonymous you could use Tor browser coupled with a VPN which should be a good placed to start. If the FBI or NSA wanted to trace back to you they probably still could.

Bare in mind that your PC has a unique mac address and meta information that is leaked while you will be online. However that is another topic all together for another day.

If you want to stop trackers on a basic level you could download the Duckduckgo ad-don for Firefox which will block all trackers for the websites that you visit.

Bare in mind that if is extremely difficult to remain truly anonymous online if even possible

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I setup a Pi-Hole DNS server at home which blocks lots of ad networks and tracking/malicious domains. I also manually set facebook.com and twitter.com to not resolve so the tracking they have on nearly every webpage in the world with their 'like' and 'tweet' buttons does not work.

Along with ublock and strict tracking protection set in Firefox, most of the annoying places that want to track me need to work harder for my precious data.

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LocalCDN (see my previous posts) is an updated fork of Decentraleyes (which appears to be not actively maintained atm).

I'm only vaguely familiar with these addons, but there seems to be a lot of overlap in functionality.
And be aware that Addons also have a tendency to phone home, sometimes even the ones that use the privacy buzzword.