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Original author(s) Michael Gundlach
Developer(s) BetaFish Incorporated
Initial release December 8, 2009; 7 years ago (2009-12-08)
Stable release
Chrome, Safari, Opera:
3.9.2 / April 7, 2017; 2 months ago (2017-04-07) (Google Chrome)[1] [1]
Development status Active
Written in JavaScript
Platform Browser Extension
Available in 51 languages[2]
Type Browser extension
License GPLv3[1]

AdBlock is a content filtering and ad blocking extension for the Google Chrome, Apple Safari (desktop and mobile), Firefox, Opera and Microsoft Edge web browsers.[2][3][4][5][6][7] AdBlock allows users to prevent page elements, such as advertisements, from being displayed. It is free to download and use, and it includes optional donations to the developers.[8] The AdBlock extension was created on December 8, 2009, which is the day that support for extensions was added to Google Chrome.[9][10]

AdBlock's efforts are not related to Adblock Plus.[11] The developer of AdBlock, Michael Gundlach, claims to have been inspired by the Adblock Plus extension for Firefox, which is itself based on the original Adblock that ceased development in 2004.[12][13]


Gundlach launched a crowdfunding campaign on Crowdtilt in August 2013 in order to found an ad campaign to raise awareness of ad blocking and to rent a billboard at Times Square.[14] After the one-month campaign, it raised $55,000.

Sales and acceptable ads[edit]

AdBlock was sold to an anonymous buyer in 2015 and on October 15, 2015 Gundlach's name was taken down from the site.[15] In the terms of the deal, the original developer Michael Gundlach left operations to Adblock's continuing director, Gabriel Cubbage, and as of October 2, 2015, AdBlock began participating in the Acceptable Ads program.[16] Acceptable Ads identifies "non-annoying" ads, which AdBlock shows by default. The intent is to allow non-invasive advertising, to either maintain support for websites that rely on advertising as a main source of revenue or for websites that have an agreement with the program.[16]


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.

AdBlock for Firefox[edit]

On September 13, 2014,[4] the AdBlock team released a version for Firefox users, ported from the code for Google Chrome, released under the same free software license as the original. Adblock.[17] The extension was removed on April 2, 2015 by an administrator on Mozilla Add-ons.[18]

The official site's knowledge base article on December 7, 2015 states that with version 44 or higher of Firefox desktop and Firefox Mobile, AdBlock will not be supported.[19][20] The last version of Adblock for those platforms will work on older versions of Firefox.[19]

AdBlock was released again on Mozilla Add-ons on November 17, 2016[21]


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 was continued to be offered as an optional add-on supported by a monthly subscription.[22]

On October 23, 2014 the developer decided to end official support for CatBlock, and made it open-source, under GPLv3 licensing, as the original extension.[23]

See also[edit]


  1. ^ a b c "Index of /releases". Index of /releases. Adblock. Retrieved 10 April 2017. 
  2. ^ a b "AdBlock - Chrome Web Store". 2015-06-10. Retrieved 2015-06-18. 
  3. ^ "Apple - Safari - Safari Extensions Gallery". Archived from the original on 2014-05-24. Retrieved 2015-06-18. 
  4. ^ a b "AdBlock for Firefox". Archived from the original on September 6, 2014. Retrieved September 6, 2014. 
  5. ^ "AdBlock extension - Opera add-ons". Retrieved 2015-06-18. 
  6. ^ "AdBlock – Windows Apps on Microsoft Store". Microsoft Store. Retrieved 2016-09-01. 
  7. ^ "AdBlock for Firefox". Retrieved 2017-02-22. 
  8. ^ "AdBlock is pay-what-you-want software". AdBlock. AdBlock. Retrieved 22 January 2016. 
  9. ^ "In Allowing Ad Blockers, a Test for Google". The New York Times. Retrieved 2015-06-18. 
  10. ^ "Is AdBlock available for my iPhone, iPad, Android, or Windows Mobile device?". AdBlock. Retrieved 4 May 2016. 
  11. ^ FAQ - Adblock Plus Project
  12. ^ Kurdi, Samer (June 22, 2011). "Adblock v. Adblock Plus: two Chrome extensions compared". Retrieved 26 May 2013. 
  13. ^ Gundlach, Michael (August 2013). "AdBlock is not Adblock Plus". Retrieved 22 December 2014. 
  14. ^ This ad blocking software is getting users to pay for it to advertise Quartz, August 30, 2013
  15. ^ first version without his name.
  16. ^ a b Williams, Owen. "Adblock extension sells to mystery buyer". Retrieved 2015-10-02. 
  17. ^ "Adblock Plus". February 2016. 
  18. ^ "AdBlock for Firefox". Mozilla Add-ons. Archived from the original on 2014-09-06. 
  19. ^ a b "Why did AdBlock stop supporting Firefox?". Official Adblock support. Adblock. Retrieved 19 January 2016. 
  20. ^ "Is AdBlock available on iPhone, iPad, or Android?". Adblock Mobile. Retrieved 20 January 2016. 
  21. ^ "AdBlock for Firefox :: Versions :: Add-ons for Firefox". Retrieved 2017-02-22. 
  22. ^ "AdBlock's Blog: CatBlock lives on". 2012-04-03. Retrieved 2015-06-18. 
  23. ^ "CatBlock from AdBlock". Retrieved 2015-06-18. 

External links[edit]