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Not to be confused with Adblock Plus.
Adblock logo.png
Original author(s) Michael Gundlach
Developer(s) BetaFish Incorporated
Initial release December 8, 2009 (2009-12-08)
Stable release

Chrome, Safari, Opera:
2.35 / June 10, 2015; 5 months ago (2015-06-10)

2.0 / November 11, 2014; 12 months ago (2014-11-11)
Preview release

Chrome, Safari, Opera:
2.19 / March 11, 2015; 8 months ago (2015-03-11)

2.0 / November 11, 2014; 12 months ago (2014-11-11)
Development status In development
Written in Javascript
Available in ગુજરાતી (Gujarati), Bahasa Indonesia, Deutsch, English, Français, Nederlands, Türkçe, català, dansk, español, hrvatski, italiano, latviešu, magyar, polski, português (Brasil), português (Portugal), română, slovenský, slovenščina, Suomi, Svenska, čeština, Ελληνικά, Српски, български, русский, українська, עברית, తెలుగు, ‫العربية, 中文 (简体), 中文 (繁體), 日本語, 한국어[1]
Type Browser extension
License GPLv3[2]

AdBlock is a content filtering and ad blocking extension for the Google Chrome, Apple Safari, Mozilla Firefox, and Opera web browsers.[1][3][4][5] AdBlock allows users to prevent page elements, such as (and mainly) advertisements, from being displayed. It is free to download and use, but users can donate any amount they want to the developers. As of July 2014, AdBlock is the most popular Google Chrome extension, with over 40,000,000 users,[6][7] and the most popular Safari extension.[8] According to an article in The New York Times,[9] the extension was created on December 8, 2009 (the day that support for extensions was added to Google Chrome). Safari support was added in June 2010.

AdBlock is not to be confused with Adblock Plus. The creator of AdBlock claims to have been inspired by the Adblock Plus extension for Firefox, which is itself based on another extension called Adblock. But otherwise AdBlock is unrelated to the other efforts.[10][11]

Acceptable Ads Program and sale[edit]

AdBlock was sold to an anonymous buyer in 2015. In the terms of the deal, original author Michael Gundlach left operations to Adblock’s continuing director, Gabriel Cubbage, and as of October 2nd, 2015, AdBlock began participating in the Acceptable Ads program. Acceptable Ads defines guidelines to identify "non-annoying" ads, which AdBlock now shows by default. The intent is to allow non-invasive advertising, so as to maintain support for websites that rely on advertising as a main source of revenue.[12] As a result of this controversial change, the original AdBlock has been continued as AdBlock Pure.[13] This free and open source project seeks to retain the integrity of the original AdBlock by blocking all ads.[14]

AdBlock for Firefox[edit]

On September 13, 2014,[15] the AdBlock team released a version for Firefox users, ported from the code for Google Chrome, released under the same free software licence as the original. The extension was removed by an administrator on Mozilla Add-ons[16] no later than April 2, 2015.[17] The official site's knowledge base article, updated July 13, 2015, states that they are working with Mozilla to fix the issue.[18]


AdBlock uses the same filter syntax as Adblock Plus for Firefox and natively supports Adblock Plus filter subscriptions. Filter subscriptions can be added from a list of recommendations in the "Filter Lists" tab of the AdBlock options page, or by clicking on an Adblock Plus auto-subscribe link.


On April 1, 2012 the developer tweaked the code to display LOLcats instead of simply blocking ads. Initially developed as a short-lived April Fool joke, the response was so positive that CatBlock is now an optional add-on supported by a monthly subscription.[19]

On October 23, 2014 the developer decided to end official support for CatBlock, and made it open-source, under the same license as the original extension.[20]

See also[edit]


  1. ^ a b "AdBlock - Chrome Web Store". 2015-06-10. Retrieved 2015-06-18. 
  2. ^ "AdBlock source". Retrieved 23 August 2015. 
  3. ^ "Apple - Safari - Safari Extensions Gallery". Retrieved 2015-06-18. 
  4. ^ [1][dead link]
  5. ^ "AdBlock extension - Opera add-ons". Retrieved 2015-06-18. 
  6. ^ "Chrome Web Store". Retrieved 2015-06-18. 
  7. ^ "AdBlock - Browse faster. Ad-free". 2010-07-20. Retrieved 2015-06-18. 
  8. ^ "Apple - Safari - Safari Extensions Gallery". Retrieved 2015-06-18. 
  9. ^ "In Allowing Ad Blockers, a Test for Google". The New York Times. Retrieved 2015-06-18. 
  10. ^ Kurdi, Samer (June 22, 2011). "Adblock v. Adblock Plus: two Chrome extensions compared". Retrieved 26 May 2013. 
  11. ^ Gundlach, Michael (August 2013). "AdBlock is not Adblock Plus". Retrieved 22 December 2014. 
  12. ^ Williams, Owen. "Adblock extension sells to mystery buyer". Retrieved 2015-10-02. 
  13. ^ "AdBlock Pure - GitHub". Retrieved 2015-11-17. 
  14. ^ "AdBlock Pure - Chrome Web Store". Retrieved 2015-11-17. 
  15. ^ "AdBlock for Firefox Version History". Mozilla Add-ons. 
  16. ^ "AdBlock for Firefox". Mozilla Add-ons. 
  17. ^ "Wikipedia Edit History Entry". April 2, 2015. 
  18. ^ "I can't get AdBlock on the Firefox add-ons site". AdBlock. July 13, 2015. Retrieved 17 July 2015. 
  19. ^ "AdBlock's Blog: CatBlock lives on". 2012-04-03. Retrieved 2015-06-18. 
  20. ^ "CatBlock from AdBlock". Retrieved 2015-06-18.