The Two Most Popular Ad Blockers, Compared
If you're looking for an ad blocker, two names come up constantly: uBlock Origin and AdBlock Plus. Both are free, widely available, and block ads — but they work very differently under the hood, and the right choice depends on your priorities.
Quick Comparison
| Feature | uBlock Origin | AdBlock Plus |
|---|---|---|
| Open Source | ✅ Yes (GPLv3) | ✅ Yes (GPLv3) |
| Memory Usage | Low | Higher |
| Acceptable Ads Program | ❌ No | ✅ Yes (on by default) |
| Default Filter Lists | Multiple (EasyList, uBlock, Peter Lowe's, etc.) | EasyList primarily |
| Custom Filter Support | Advanced | Basic |
| Element Picker | ✅ Yes | ✅ Yes |
| Tracker Blocking | Strong (with EasyPrivacy) | Moderate |
| Corporate Backing | Independent developer | eyeo GmbH (commercial) |
The Acceptable Ads Controversy
This is the most important difference between the two. AdBlock Plus runs an Acceptable Ads program — companies pay eyeo GmbH to have their ads whitelisted and shown to AdBlock Plus users by default. The theory is that "non-intrusive" ads are okay.
Critics argue this creates a conflict of interest: an ad blocker that profits from letting ads through. You can disable the Acceptable Ads feature in AdBlock Plus settings, but it's on by default.
uBlock Origin has no such program. It blocks everything on its filter lists, with no exceptions for paying advertisers. This makes it philosophically cleaner for users who want uncompromising blocking.
Performance: uBlock Origin Wins Clearly
uBlock Origin is well-known for its efficient architecture. It uses less RAM and CPU than AdBlock Plus, which matters on older computers or when running many browser tabs. Independent tests by browser performance researchers consistently show uBlock Origin has a smaller performance footprint.
Filtering Power
By default, uBlock Origin activates more filter lists and has a more advanced filtering engine. It supports:
- Network-level blocking
- Cosmetic filtering (hiding page elements)
- Procedural cosmetic filters
- Custom user rules
- Dynamic filtering (for power users)
AdBlock Plus covers the basics well but lacks some of the advanced filtering capabilities that power users rely on.
Ease of Use
For beginners, both extensions are straightforward — install and forget. AdBlock Plus has a slightly cleaner and more approachable interface. uBlock Origin's dashboard is more technical but gives experienced users much more control.
Browser Compatibility
Both extensions work on Chrome, Firefox, Edge, and Opera. For Safari, neither works natively — Safari users should look at AdGuard for Safari or the AdBlock extension (not AdBlock Plus — they're different products).
What About Manifest V3?
Google's Manifest V3 update for Chrome extensions limits the filtering capabilities of ad blockers. uBlock Origin has released uBlock Origin Lite for MV3-compliant Chrome. The full-featured version of uBlock Origin remains available on Firefox, which is one reason many privacy-conscious users prefer Firefox for ad blocking.
Our Recommendation
For most users who want maximum ad blocking effectiveness and no Acceptable Ads program: uBlock Origin is the better choice. It's faster, blocks more, and has no commercial conflicts of interest.
If you're a casual user who finds uBlock Origin's settings intimidating, AdBlock Plus is still a decent option — just remember to turn off the Acceptable Ads program in its settings.