Sunday, November 16, 2025

Ad Blocking 101 — What It Actually Does (and Doesn’t)

I see a lot of posts that look like this:

“I installed an ad blocker, turned off personalized ads, cleared cookies…
Why am I still seeing ads / being ‘tracked’ / feeling watched?!”

So, let’s do a very low–drama, very human Ad Blocking 101.
What it actually does for you, what it doesn’t, and what you can do today without turning your life into a full-time OPSEC job.

Context: I work on a privacy-focused Android browser, but this post is product-agnostic. Use whatever tools you like.


1. What “ad blocking” actually is (in plain language)

When you open a web page, your browser is basically doing this:

“Hey Internet, give me:
– the article text
– some images
– maybe a video
– oh and… 20 different scripts from companies you’ve never heard of.”

Some of those extra requests are:

  • Ad scripts (banners, popups, video ads)
  • Tracking / analytics scripts (what you click, how long you stay, who referred you)

An ad blocker is basically a very picky bouncer at the door.
It holds filter lists that say:

  • “If the request goes to this ad domain → block it.”
  • “If this looks like a tracking script → block it.”
  • “If this element matches this pattern → hide it.”

Depending on the tool, it may block:

  • inside the browser
  • at DNS/VPN level
  • or a mix

No magic — just rules.


2. What ad blocking is good at

2.1 Cutting down in-your-face annoyances

Pop-ups, autoplaying video ads, fake “You won an iPhone!” messages, sticky banners.
The bouncer says “nope”, pages become calmer.

2.2 Saving bandwidth, battery, and sanity

Every ad = extra images, JS, CPU/GPU usage.
Fewer ads → fewer requests → less junk → less heat + fewer wasted resources.

2.3 Reducing some tracking

Blocking ad domains cuts off a chunk of basic behavioral tracking.
Not perfect, but meaningful.

Think of it this way:
You’re not invisible, but you’re less transparent.


3. What ad blocking does NOT do

3.1 It does not guarantee “no ads ever again”

Websites now embed:

  • sponsored paragraphs
  • native ads
  • recommended content blocks

They look like normal content, so blockers can’t filter them.

3.2 It does not make you anonymous

Ad blocking ≠ anonymity.

It does not hide:

  • your IP
  • the fact you're logged into big platforms
  • device/browser fingerprinting
  • ISP visibility

Real anonymity needs tools like VPN, Tor, and better habits.

3.3 It may break some sites

Sometimes blocking scripts breaks:

  • login
  • comments
  • video players
  • checkout flows

More aggressive blocking = more breakage risk.


4. Common Myths (Reality Check)

Myth #1: “One blocker = no ads ever.”
Reality: Fewer ads, not zero. Myth #2: “If I block ads, nobody can track me.”
Reality: Plenty still can.

Myth #3: “Sites that still show ads are evil.”
Reality: Many are simply trying to survive.

Myth #4: “If a site breaks, it's the site’s fault.”
Reality: Often it’s a filter list being too aggressive.


5. Practical advice (for normal humans)

Step 1: Turn on basic blocking

Use built‑in browser blocking or an extension.

Step 2: Use one trusted browser for most browsing

Avoid random in‑app browsers.

Step 3: Accept that some sites need lighter rules

Whitelist or reduce blocking only when necessary.

Step 4: Combine blocking with basic privacy habits

  • log out of services you don’t need
  • restrict app permissions
  • avoid blindly accepting all cookies

Blocking works best as part of a bundle of habits.


6. TL;DR

Ad blocking = a smart filter for some junk.
It makes the web calmer, lighter, and somewhat more private.

It does not:

  • make you anonymous
  • guarantee ad‑free browsing
  • stop native/sponsored content

Combine blocking with good habits → best results.

Use ad blocking as a tool, not a religion.

If the web feels less annoying after you set it up,
you’re already ahead of most people.

submitted by /u/David_BrowserDev
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