The fastest way to block ads and popups

The simplest approach is to install an ad blocker extension in your browser. Extensions like uBlock Origin, Adblock Plus, and Ghostery sit between the websites you visit and the ads they try to load — they intercept the requests and prevent the ads from appearing at all. Most ad blockers work the same way: you install them once, they run automatically on every page you visit, and you see fewer ads without doing anything else.

Some browsers also include built-in popup blocking that works without an extension. Chrome, Firefox, Safari, and Edge all block most popups by default, though aggressive sites sometimes find ways around these protections. If popups still get through, an extension adds another layer of defense.

The trade-off is that some websites detect ad blockers and ask you to turn them off before you can read their content. You can usually whitelist those sites (tell your ad blocker to let their ads through) if you want to support them, or you can leave the blocker on and find the content elsewhere.

Key Takeaways

  • uBlock Origin and Adblock Plus are the most widely used ad blocker extensions and work in Chrome, Firefox, Safari, and Edge.
  • Most modern browsers block popups automatically, but an extension provides stronger protection against aggressive popup campaigns.
  • Ad blockers can slow down page load times slightly on sites with heavy advertising, though the difference is usually small.
  • Some websites detect ad blockers and refuse to load content until you disable them, and you can whitelist individual sites if you choose.
  • Browser settings let you block specific types of popups (like those that open in new windows) without installing an extension.

How ad blocker extensions work

When you install an ad blocker, it loads a list of known ad servers and tracking domains — the computers that actually deliver ads to websites. As you browse, the extension checks every image, video, and script your browser tries to load against that list. If it matches, the extension blocks the request before it reaches your computer. The ad never loads, so you never see it.

Different ad blockers use different lists. uBlock Origin uses multiple filter lists by default and lets you add more. Adblock Plus maintains its own list but also supports community-created lists. Ghostery focuses on blocking trackers (companies that follow you across websites) in addition to ads. All three are free and work across multiple browsers.

The lists update automatically, usually daily or weekly, so new ads and trackers get blocked without you having to do anything. If a website changes how it delivers ads, the list maintainers update their filters to catch the new method.

Built-in browser popup blocking and how to adjust it

Chrome, Firefox, Safari, and Edge all have popup blocking turned on by default. This catches most popups that try to open in new windows or tabs, but it does not catch popups that appear inside the page itself (sometimes called "in-page popups" or "modal popups"). Those require an extension to block.

To adjust popup blocking in Chrome, go to Settings > Privacy and Security > Site Settings > Pop-ups and redirects. You can turn blocking on or off entirely, or add specific websites to an allow list or block list. Firefox has the same option under Settings > Privacy & Security > Permissions > Pop-ups. Safari users go to Safari > Settings > Security and check "Block pop-up windows." Edge uses Settings > Privacy, Search, and Services > Site Permissions > Pop-ups and redirects.

If a website you trust needs popups to work (some banking sites use them for security), you can add it to your allow list so popups from that site will open. Most people never need to adjust these settings — the defaults block the popups that matter.

Choosing between different ad blockers

uBlock Origin is the most popular choice for people who want strong blocking with minimal setup. It blocks ads, popups, and many trackers out of the box, and it uses less memory than some competitors. It works in Chrome, Firefox, Safari, and Edge. The extension is free and has no paid version.

Adblock Plus is simpler and lighter on system resources, which matters if you have an older computer or limited RAM. It blocks ads effectively but does not block as many trackers as uBlock Origin. It also has a paid version (Adblock Plus Premium) that adds extra features, though the free version is sufficient for most people.

Ghostery focuses on blocking trackers — companies that follow you across websites to build a profile of your browsing habits. If privacy from tracking is your main concern, Ghostery is a good choice. It also blocks ads, but less aggressively than uBlock Origin. Like the others, it is free.

All three are safe and widely used. The differences are small enough that you can try one, and if you do not like it, uninstall it and try another. There is no penalty for switching.

Why some websites block ad blockers

Websites make money from ads. When you block ads, the website loses that revenue. Some websites detect ad blockers and refuse to let you see their content until you turn the blocker off. Others show a message asking you to whitelist them. A few do both.

You have three options when you hit a site that blocks ad blockers. First, you can disable your ad blocker for that site only (most extensions let you do this with one click). Second, you can whitelist the site, which tells your ad blocker to let that site's ads through. Third, you can leave the blocker on and find the content elsewhere.

Which option you choose depends on how much you value the content and whether you trust the site. News sites and blogs often ask for whitelisting. Paywalled sites (ones that charge for access) usually do not block ad blockers because they make money from subscriptions, not ads. Streaming sites and social media platforms almost never block ad blockers because they have other ways to make money.

Performance impact of ad blockers

Ad blockers use a small amount of your computer's memory and processing power. On modern computers, the impact is usually too small to notice. On older computers or phones with limited RAM, you might see a slight slowdown in page load times, especially on websites with heavy advertising.

The slowdown, when it exists, usually comes from the ad blocker checking every element on the page against its filter list. Simpler ad blockers like Adblock Plus tend to use less memory than more aggressive ones like uBlock Origin with multiple filter lists enabled. If you notice your browser is slow, you can try a lighter ad blocker or disable some of the extra filter lists.

In most cases, the performance benefit of not loading ads (which can be large files) outweighs the small cost of running the ad blocker. Pages often load faster with an ad blocker on than off, because the browser is not downloading ad files.

Blocking ads on mobile devices

Mobile browsers have fewer extension options than desktop browsers. Safari on iPhone and iPad supports content blockers, which work like ad blocker extensions. You can install apps like 1Blocker, Adblock Plus, or Ghostery from the App Store, then enable them in Safari Settings > Apps > Extensions.

Chrome on Android does not support extensions, so you cannot install an ad blocker the same way you would on a desktop. Your options are to use a different browser (Firefox on Android supports extensions) or to use a DNS-level blocker like NextDNS or Cloudflare's 1.1.1.1 for Families, which blocks ads at the network level before they reach your device. These work across all apps, not just your browser.

If you use Chrome on Android and want ad blocking, you can also try Samsung Internet (if you have a Samsung phone) or Firefox, both of which support extensions. The trade-off is switching browsers, but you get the same ad blocking you would on desktop.

Frequently Asked Questions

Will an ad blocker break websites or make them not work?

Rarely. Most websites work fine with ad blockers on. Occasionally a site's layout breaks because it was designed assuming ads would be there, leaving empty space. Some sites refuse to load content until you disable the blocker. If a website does not work, you can turn off the ad blocker for that site with one click.

Is it safe to install ad blocker extensions?

uBlock Origin, Adblock Plus, and Ghostery are all safe and widely used. Install them only from your browser's official extension store (Chrome Web Store, Firefox Add-ons, Safari App Store, or Edge Add-ons). Do not install ad blockers from random websites, as those may contain malware.

Can websites see that I am using an ad blocker?

Yes, websites can detect that ads are not loading and assume you are using an ad blocker. That is why some sites ask you to disable it. They cannot see which ad blocker you are using or what other extensions you have installed.

Do I need both a browser popup blocker and an extension?

The built-in popup blocker catches most popups that open in new windows. An extension catches popups that appear inside the page itself, which the browser cannot block. If you are not bothered by in-page popups, the browser's built-in blocker is enough. If you are, an extension adds protection.

What is the difference between ad blockers and tracker blockers?

Ad blockers stop ads from loading. Tracker blockers stop companies from following you across websites. Some extensions do both (like uBlock Origin and Ghostery), while others focus on one or the other. If you care about privacy, a tracker blocker matters. If you just want fewer ads, an ad blocker alone is enough.