Despite having similar names, AdBlock (https://getadblock.com) and Adblock Plus (ABP) (https://adblockplus.org) are unrelated products developed by different companies. They work the same way, with some differences.
AdBlock comes with the Malware Protection filter list already enabled. Right out of the box, so to speak, AdBlock is serving as a second line of defense against malware.
- While both AdBlock and ABP get most of their ad-blocking mojo from EasyList, AdBlock also uses a custom list with additional filters that, among other things, block ads that other filter lists don't care about.
- AdBlock offers several additional filter lists right in the options, including lists that protect you from trackers and remove annoyances other than ads.
- You can disable AdBlock on individual pages. (In Firefox, ABP can also be disabled on individual pages. In Chrome, however, ABP is either on or off for the entire site.)
- In AdBlock's advanced mode, you can see all the resources (ads and other page elements) it's blocking, hiding, and letting through.
- AdBlock allows you to whitelist specific YouTube channels you want to support. (True fact: AdBlock is the only ad blocker that allows this.)
The user interface (UI). In other words, AdBlock and ABP just plain look different.
What's the same?
- You can see the number of ads blocked on a page and the total number of ads blocked since you installed AdBlock or ABP.
- You can show the number of page ads blocked on the button in the extensions bar.
- Both AdBlock and ABP use EasyList as their primary source of filter rules. (But refer to the note above for a major difference.)
Why are the names so similar?
Long, long ago, somebody (not us) created a Firefox add-on called Adblock. Later on, another team created a different Firefox add-on and adopted the name Adblock Plus (ABP).
When Google Chrome came along, the Adblock Plus team wasn't interested in supporting the new browser. Michael Gundlach created an ad blocking extension he called, naturally enough, AdBlock for Chrome. It went on to become the most popular Chrome extension. Then the Adblock Plus team decided to support Chrome after all. Over time, both AdBlock and ABP added support for additional browsers and platforms. And that's why the two most popular ad blockers have such similar names. Aren't you glad you asked?