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Understanding and blocking
invisible web trackers
Alison Macrina
alison@libraryfreedomproject.org
How does invisible tracking work?
1. You visit a website
2. Dozens of domains load in the
background
● Tiny images
● Invisible javascript (code that can run in
your browser)
● Cookies/supercookies
● Web bugs
● Browser fingerprinting
Who is doing the tracking?
● Advertisers
● A/b testers
● Analytics
● Social media widgets
What do they know about me?
How long do they keep the data?
NoScript
Menu → options → whitelist
Best combo:
Tor Browser
and NoScript
● More privacy resources on LFP's site
● Mailing list:
lists.riseup.net/www/subscribe/libraryfreedom
Questions?
Contact:
@flexlibris
alison@libraryfreedomproject.org

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2 macrina-mar16

  • 1. Understanding and blocking invisible web trackers Alison Macrina alison@libraryfreedomproject.org
  • 2. How does invisible tracking work? 1. You visit a website 2. Dozens of domains load in the background ● Tiny images ● Invisible javascript (code that can run in your browser) ● Cookies/supercookies ● Web bugs ● Browser fingerprinting
  • 3. Who is doing the tracking? ● Advertisers ● A/b testers ● Analytics ● Social media widgets What do they know about me? How long do they keep the data?
  • 4.
  • 5.
  • 6.
  • 7. NoScript Menu → options → whitelist Best combo: Tor Browser and NoScript
  • 8. ● More privacy resources on LFP's site ● Mailing list: lists.riseup.net/www/subscribe/libraryfreedom Questions? Contact: @flexlibris alison@libraryfreedomproject.org