Browser Recommendation:

Mozilla Firefox:

Firefox is fast, reliable, open source and respects your privacy. Don't forget to adjust the settings according to our recommendations:

Tor Browser Bundle:

Tor Browser is your choice if you need an extra layer of anonymity. It's a modified version of Firefox, it comes with pre-installed privacy add-ons, encryption and an advanced proxy.

https://www.mozilla.org/en-US/firefox/new/?utm_medium=referral&utm_source=firefox-com
https://www.torproject.org/

Browser Fingerprint - Is your browser configuration unique?

Your Browser sends information that makes you unique amongst millions of users and therefore easy to identify.

When you visit a web page, your browser voluntarily sends information about its configuration, such as available fonts, browser type, and add-ons. If this combination of information is unique, it may be possible to identify and track you without using cookies. EFF created a Tool called Panopticlick to test your browser to see how unique it is.

https://panopticlick.eff.org/

WebRTC IP Leak Test - Is your IP address leaking?

How to disable WebRTC in Firefox?

In short: Set "media.peerconnection.enabled" to "false" in "about:config".

Explained:

Enter "about:config" in the firefox address bar and press enter.
Press the button "I'll be careful, I promise!"
Search for "media.peerconnection.enabled"
Double click the entry, the column "Value" should now be "false"
Done. Do the WebRTC leak test again.

If you want to make sure every single WebRTC related setting is really disabled change these settings:

media.peerconnection.turn.disable = true
media.peerconnection.use_document_iceservers = false
media.peerconnection.video.enabled = false
media.peerconnection.identity.timeout = 1

Now you can be 100% sure WebRTC is disabled.

How to fix the WebRTC Leak in Google Chrome?

There is no known working solution, only a plugin that is easily circumvented. Please use Firefox instead.

Excellent Firefox Privacy Add-ons

Stop tracking with "Disconnect"

https://addons.mozilla.org/firefox/addon/disconnect/

Block Ads with "uBlock Origin"

https://addons.mozilla.org/firefox/addon/ublock-origin/

Hinder Browser Fingerprinting with "Random Agent Spoofer"

https://addons.mozilla.org/firefox/addon/random-agent-spoofer/

Automatically Delete Cookies with "Self-Destructing Cookies"

https://addons.mozilla.org/firefox/addon/self-destructing-cookies/

Encryption with "HTTPS Everywhere"

https://www.eff.org/https-everywhere

Block Content Delivery Networks with "Decentraleyes"

https://addons.mozilla.org/firefox/addon/decentraleyes/

The following add-ons require quite a lot of interaction from user to get things working. Some sites will not work properly until you have configured the add-ons.

Stop cross-site requests with uMatrix

https://addons.mozilla.org/firefox/addon/umatrix/

Be in total control with "NoScript Security Suite"

https://addons.mozilla.org/firefox/addon/noscript/

Content control with "Policeman"

https://addons.mozilla.org/firefox/addon/policeman/

Firefox: Privacy Related "about:config" Tweaks

Preparation:

Enter "about:config" in the firefox address bar and press enter.
Press the button "I'll be careful, I promise!"
Follow the instructions below...

Getting started:

privacy.trackingprotection.enabled = true
This is Mozilla’s new built in tracking protection.
geo.enabled = false
Disables geolocation.
browser.safebrowsing.enabled = false
Disable Google Safe Browsing and phishing protection. Security risk, but privacy improvement.
browser.safebrowsing.malware.enabled = false
Disable Google Safe Browsing malware checks. Security risk, but privacy improvement.
dom.event.clipboardevents.enabled = false
Disable that websites can get notifications if you copy, paste, or cut something from a web page, and it lets them know which part of the page had been selected.
network.cookie.cookieBehavior = 1
Disable cookies
0 = Accept all cookies by default
1 = Only accept from the originating site (block third party cookies)
2 = Block all cookies by default
network.cookie.lifetimePolicy = 2
cookies are deleted at the end of the session
0 = Accept cookies normally
1 = Prompt for each cookie
2 = Accept for current session only
3 = Accept for N days
browser.cache.offline.enable = false
Disables offline cache.
browser.send_pings = false
The attribute would be useful for letting websites track visitors’ clicks.
webgl.disabled = true
WebGL is a potential security risk. Source
dom.battery.enabled = false
Website owners can track the battery status of your device. Source
browser.sessionstore.max_tabs_undo = 0
Even with Firefox set to not remember history, your closed tabs are stored temporarily at Menu -> History -> Recently Closed Tabs.

Related Information

ffprofile.com - Helps you to create a Firefox profile with the defaults you like.
mozillazine.org - Security and privacy-related preferences.
user.js Firefox hardening stuff - This is a user.js configuration file for Mozilla Firefox that's supposed to harden Firefox's settings and make it more secure.
Privacy Settings - A Firefox addon to alter built-in privacy settings easily with a toolbar panel.

https://ffprofile.com/
http://kb.mozillazine.org/Category:Security_and_privacy-related_preferences
https://github.com/pyllyukko/user.js
https://addons.mozilla.org/en-US/firefox/addon/privacy-settings/