829:
147:
843:
650:: On Chromium-based browsers, uBO may not be fully ready to block network requests from already opened tabs immediately upon browser launch. This can allow some tracker or advertisement payloads to load before uBO becomes active, which is especially problematic for users who utilize default-deny modes for third-party resources or JavaScript. While there is a mitigation setting available, it is not enabled by default and does not cover all use cases.
570:. Since the initial URL contained a sub-domain of the current page, it was interpreted by browsers as a first-party request and so was allowed by the filtering rules in uBlock Origin (and in similar extensions). The uBlock Origin developer came up with a solution using a DNS API which is exclusive to Firefox 60+. The new feature was implemented in uBlock Origin 1.25, released on February 19, 2020.
38:
29:
464:
As a result, uBlock Origin Lite was created and designed to comply with the
Manifest V3 (MV3) extension framework. uBO Lite differs significantly from uBO in several key aspects, primarily due to the constraints and design goals associated with MV3. Specifically, it lacks filter list updates outside
385:
On April 3, 2015, Hill transferred the uBlock project to Chris
Aljoudi due to frustrations with dealing with requests as the project's popularity increased. "These projects are to me, not a full time job. It stopped being a hobby when it felt more and more like a tedious job. I will keep maintaining
605:
uBlock Origin (uBO) faces several technical limitations when used on
Chromium-based browsers compared to its performance on Firefox, and as a result, users may experience less effective ad blocking, potential exposure to unwanted content, and slower performance when using uBO on Chromium-based
389:
Since
October 2017, uBlock Origin has been completely separated from Aljoudi's uBlock. Aljoudi created ublock.org to host and promote uBlock and to request donations. In response, uBlock's founder Raymond Hill stated that "the donations sought by ublock.org are not benefiting any of those who
406:
uBlock Origin remains independent and does not allow ads for payment. The project refuses donations and instead advises supporters to donate to maintainers of block lists. Hill continued to work on the extension under the name uBlock Origin, abbreviated as uBO and originally as
317:
before 13. uBlock Origin has received praise from technology websites and is reported to be much less memory-intensive than other extensions with similar functionality. uBlock Origin's stated purpose is to give users the means to enforce their own (content-filtering) choices.
557:, strict domain blocking, cosmetic filtering, blocking remote fonts, and JavaScript disabling were also added to uBlock Origin. The Firefox version of uBlock Origin has an extra feature which helps to foil attempts by web sites to circumvent blockers.
321:
uBlock Origin is actively developed and maintained by its creator and lead developer
Raymond Hill. As of September 2024, the Chrome version of uBlock Origin had over 37 million active users and the Firefox version had over 7 million active users.
565:
In
November 2019, a uBlock Origin user reported a novel technique used by some sites to bypass third-party tracker blocking. These sites link to URLs that are sub-domains of the page's domain, but those sub-domains resolve to third-party hosts via a
397:
and resumed development. From
February 2019, uBlock began allowing users to participate in "acceptable ads", a program run by Adblock Plus that allows some ads deemed "acceptable" and nonintrusive, and for which larger publishers pay a fee.
688:
in incognito mode. IndexedDB instances are reset in incognito mode, causing uBO to start with out-of-date filter lists and reduced efficiency. Firefox does not face this issue, allowing for more efficient storage and retrieval of
512:
are also enabled as default, preventing users from visiting malicious websites such as those used for phishing, scams, malware, and more. Some additional features include dynamic filtering of scripts and
453:
and privacy extensions to block and modify network connections. Following Google's implementation of
Manifest V3 and the end of support for V2, uBlock Origin's effectiveness is drastically reduced in
374:
survey reported an 833% growth from
November 2014 to August 2015, the strongest growth among adblockers listed. The report attributed the growth to the desire of users for pure blockers, outside the "
644:
option in network filtering, which allows for response body modification, is less effective in
Chromium-based browsers. Firefox's support for this feature enables more robust content manipulation.
1234:
1177:
670:
for core filtering code paths on Chromium-based browsers due to the additional permissions required in the extension manifest, which could complicate the extension's publication in the
578:
Technology websites and user reviews for uBlock Origin have regarded the extension as less resource-intensive than extensions that provide similar feature sets such as Adblock Plus. A
386:
my version (and share with whoever care to use it) because it guarantees the tool will match what I want out of it." Hill created his own fork and renamed it uBlock Origin on April 6.
1920:
1951:
2616:
880:
uBlock also supports Firefox legacy browsers (including SeaMonkey and Pale Moon), use the firefox-legacy release starting with firefox-legacy-1.16.4, see
2301:
2273:
1151:
597:
of the filters the user has enabled, which contributes to accelerated browser start-up speed when compared to retrieving filters from cache every time.
2022:
1244:
2459:
351:
along with another blocking extension called uMatrix, designed for advanced users. uBlock was developed by Raymond Hill to use community-maintained
2651:
2248:
1185:
390:
contributed most to create uBlock Origin." The development of uBlock stopped in August 2015 but there were sporadic updates from January 2017.
465:
of extension updates, and has no custom filters, strict-blocked pages, per-site switches, or dynamic filtering. Non-Chromium browsers such as
1129:
834:
469:
are unaffected. Google has been criticized for implementing some of these features due to its domination in the online advertising market.
582:, conducted in August 2015 with ten blocking extensions, showed uBlock Origin as the most resource-efficient among the extensions tested.
1607:
2626:
1347:
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1527:
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2095:
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660:, potentially leading to unwanted network requests. Firefox, in contrast, reliably prevents pre-fetching when it is disabled in uBO.
265:
1912:
1973:
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2383:
1943:
335:
uBlock was initially named "μBlock" but the name was later changed to "uBlock" to avoid confusion as to how the Greek letter
2585:
1266:
617:. This limitation reduces the efficiency of blocking third-party trackers, a capability that uBO fully utilizes on Firefox.
2606:
1107:
590:
634:, is currently only available in Firefox, limiting the effectiveness of uBO's HTML filtering on Chromium-based platforms.
1239:
126:
2646:
681:
594:
549:(this feature was removed in version 1.38 on all platforms except Android, as most browsers are no longer vulnerable).
430:
340:
100:
37:
2309:
1766:
1504:
2621:
2069:"Google is once again dictating the future of the online ad industry and all its rivals can do is brace for impact"
437:). In April 2020, this fork was deprecated as Microsoft replaced Microsoft Edge Legacy with a Chromium-based Edge.
204:
1577:
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1426:
2332:
2041:
1401:
525:
627:
before they are parsed by the browser is hindered in Chromium-based browsers. This feature, enabled by the
613:: Chromium-based browsers lack the ability to uncloak third-party servers disguised as first-party through
2601:
2148:
716:
707:
504:
and a number of community-maintained lists are available at installation. Among the host files available,
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uBlock Origin is actively developed for applications based on two major layout engines.
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uBlock Origin includes a growing list of features not available in uBlock, including:
508:
and lists of malware domains such as uBlock Origin's own anti-malicious filter called
2595:
1809:
811:
712:
454:
286:
1235:"Adblock Plus vs. Ghostery vs. Ublock Origin: Not All Adblockers Were Created Equal"
978:
2553:
2528:
2126:
1348:"uBlock for Chrome is a resource-friendly adblocker by the HTTP Switchboard author"
624:
614:
567:
514:
501:
487:
483:
379:
2023:"Mozilla reaffirms that Firefox will continue to support current content blockers"
1738:
1552:
667:
657:
450:
446:
282:
1474:
824:
160:
58:
48:
1987:
768:
656:: In Chromium-based browsers, websites may override user settings regarding
554:
310:
2554:"Explanation of the state of uBlock Origin (and other blockers) for Safari"
28:
1889:
922:
585:
uBlock Origin surveys what style resources are required for an individual
2274:"uBlock Origin 1.25 Now Blocks Cloaked First-Party Scripts, Firefox Only"
2198:
856:
802:
586:
491:
371:
344:
2503:
1861:"uBlock Origin adblocker now available for Microsoft Edge via the Store"
1585:
750:
466:
423:
394:
298:
1108:"uBlock, the Memory-Friendly Ad-Blocker, Is Now Available for Firefox"
2558:
1992:
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1316:
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1026:
983:
782:
546:
419:
415:
2577:
2333:"Adblock Plus vs uBlock Origin | Which one to Choose In 2017? | RMG"
2096:"Google's Manifest V3 Still Hurts Privacy, Security, and Innovation"
1207:
339:(Mu/Micro) in "μBlock" should be pronounced. Development started by
215:
135:
1661:
1528:"uBlock Origin is completely unrelated to the web site ublock.org"
1130:"How to add custom filters to Chrome ad-blocking extension μBlock"
2249:"uBlock Origin Now Blocks Sneaky First-Party Trackers in Firefox"
414:
In January 2016, uBlock Origin was added to the repositories for
500:
are enabled by default. The extensions are capable of importing
336:
1974:"Chrome Users Beware: Manifest V3 is Deceitful and Threatening"
2359:"uBlock Origin - Better Than AdBlock Plus? - Make Tech Easier"
2149:"uAssets/filters/badware.txt at master · uBlockOrigin/uAssets"
1944:"Google Chrome could soon kill off most ad-blocker extensions"
631:
433:
of uBlock Origin for the Microsoft Edge browser (now known as
1152:"Are there any trustworthy sources for downloading software?"
363:
standards. First released in June 2014 as a Chrome and Opera
245:
1178:"μBlock aims to block ads without draining system resources"
367:, in 2015 the extension became available in other browsers.
684:
for storing filter lists and other data due to issues with
674:. This limitation can affect performance and functionality.
2529:"Catalina compatibility · Issue #156 · el1t/uBlock-Safari"
903:
254:
2094:
Cyphers, Alexei Miagkov and Bennett (December 14, 2021).
1913:"Google Chrome will limit ad blockers starting June 2024"
242:
680:: uBO on Chromium-based browsers cannot effectively use
422:
16.04. The extension was awarded "Pick of the Month" by
2384:"10 Ad Blocking Extensions Tested for Best Performance"
1402:"The Ad Blocker Landscape: What You Need To Know Today"
2302:"uBlock ad blocker added to Mozilla's extensions site"
266:
257:
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239:
210:
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186:
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156:
125:
99:
77:
57:
47:
2067:
1767:"Official uBlock Origin add-on lands for Firefox"
791:(desktop: uBlock Origin 1.10.0 and later (Beta)).
553:Site-specific switches to toggle the blocking of
2296:
2294:
1854:
1852:
1074:
1072:
561:CNAME-uncloaking third-party trackers in Firefox
2122:"Ad blockers struggle under Chrome's new rules"
2008:"More details on the transition to Manifest V3"
623:: uBO's ability to filter the response body of
545:, hyperlink auditing, and IP address leaks via
2174:"Prevent WebRTC from leaking local IP address"
1429:. Sourcepoint and comScore. September 16, 2015
948:
946:
541:inspector, privacy-oriented options to block
8:
2460:"Apple - Safari - Safari Extensions Gallery"
810:(legacy) (uBlock Origin is available on the
21:
1427:"The state of ad blocking - September 2015"
506:Peter Lowe's ad servers & tracking list
429:On December 11, 2016, Nik Rolls released a
145:
20:
1064:pronounced you-block origin (/ˈjuːˌblɒk/)
393:In July 2018, ublock.org was acquired by
2224:"Inline script tag filtering – Overwiew"
2042:"Don't Play in Google's Privacy Sandbox"
2021:Brinkmann, Martin (September 24, 2022).
355:, while adding features and raising the
2617:Internet properties established in 2014
2306:Jim Lynch, Technology and Other Musings
942:
873:
517:and a tool for webpage element hiding.
482:uBlock Origin supports the majority of
445:In 2023, Google made changes known as "
1954:from the original on December 19, 2020
1923:from the original on November 22, 2023
1233:Gardiner, Michael (November 5, 2015).
1128:Brinkmann, Martin (October 10, 2014).
601:Limitations in Chromium-based browsers
2435:"uBlock Origin works best on Firefox"
2410:"Notes on memory benchmarks, selfies"
2120:Claburn, Thomas (September 8, 2022).
1883:
1881:
73:Deathamns, Chris Aljoudi, Alex Vallat
7:
2586:uBlock Origin on the Chrome Webstore
2040:Cyphers, Bennett (August 30, 2019).
1859:Rubino, Daniel (December 11, 2016).
1608:"uBlock Incorporates Acceptable Ads"
1150:Schofield, Jack (January 29, 2015).
835:Free and open-source software portal
2486:"What is Kiwi Browser about ?"
2357:Harper, Christopher (May 2, 2015).
1610:. February 23, 2019. Archived from
1346:Brinkmann, Martin (June 24, 2014).
1176:Whitwam, Ryan (February 12, 2015).
589:rather than relying on a universal
537:Interface enhancements including a
2331:Kesari, Varun (October 28, 2017).
1754:Resources for uBlock Origin (uBO)
1526:Hill, Raymond (October 21, 2017).
1400:Levine, Barry (October 14, 2015).
979:"Changelog for the first versions"
14:
1911:Amadeo, Ron (November 21, 2023).
1712:"Why don't you accept donations?"
285:. The extension is available for
1106:Henry, Alan (January 27, 2015).
1058:. December 25, 2022 – via
954:"Contributors to gorhill/uBlock"
841:
827:
531:A dynamic URL filtering feature.
449:" to the WebRequest API used by
235:
36:
27:
1584:. July 13, 2018. Archived from
1448:Hill, Raymond (April 3, 2015),
1374:"Changes from HTTP Switchboard"
629:webRequest.filterResponseData()
2652:Software using the GPL license
2100:Electronic Frontier Foundation
2046:Electronic Frontier Foundation
1830:DeVaney, Scott (May 2, 2016).
42:uBlock Origin pop-up interface
1:
1888:Rolls, Nik (June 12, 2021),
1789:"Debian Sid - uBlock Origin"
1240:International Business Times
920:Unofficial release. Fork by
901:Unofficial release. Fork by
524:A mode to assist those with
273:) is a free and open-source
2414:uBlock GitHub documentation
1832:"May 2016 Featured Add-ons"
759:(mobile: 0.9.1.0 and later)
753:(desktop: 0.85.5 and later)
490:. The popular filter lists
2668:
2627:Free Firefox WebExtensions
1052:"uBlock Origin: README.md"
911:from the official project.
889:/uBlock-for-firefox-legacy
765:(desktop: 1.3.0 and later)
2642:Internet privacy software
313:, as well as versions of
121:
95:
35:
26:
2637:Google Chrome extensions
1810:"Ubuntu - uBlock Origin"
1056:uBlock GitHub Repository
1027:"Completed translations"
648:Browser Launch Filtering
593:. The extension takes a
370:A joint Sourcepoint and
106:1.59.0 / 30 July 2024
2462:. Apple. Archived from
1292:"uBlock Origin Firefox"
638:Response Body Filtering
526:color vision deficiency
2632:Free security software
2612:Advertising-free media
2388:Raymond Tech Resources
2228:GitHub, gorhill/uBlock
2178:GitHub, gorhill/uBlock
2027:Ghacks Technology News
1475:"Please clarify uBlock
1267:"uBlock Origin Chrome"
534:Logging functionality.
478:Blocking and filtering
378:" program operated by
83:; 10 years ago
53:Raymond Hill (gorhill)
2492:. September 22, 2019.
1578:"An update on uBlock"
814:in beta from 1.10.0).
793:Stopped working with
435:Microsoft Edge Legacy
108:; 48 days ago
16:Web browser extension
2607:Ad blocking software
2504:"el1t/uBlock-Safari"
1891:nikrolls/uBlock-Edge
1836:Mozilla Add-ons Blog
1662:"About Adblock Plus"
1614:on November 30, 2019
1553:"uBlockAdmin/uBlock"
1080:"uBlock / README.md"
923:Nik Rolls (nikrolls)
795:macOS 10.15 Catalina
777:Previously supported
737:(Chromium) (desktop)
1976:. December 9, 2021.
1642:. February 13, 2019
757:Firefox for Android
702:Currently supported
694:Supported platforms
678:Storage Compression
666:: uBO does not use
23:
2647:Online advertising
1296:addons.mozilla.org
904:Ellis Tsung (el1t)
441:uBlock Origin Lite
81:June 23, 2014
49:Original author(s)
2622:Firewall software
2466:on March 10, 2016
2390:. August 26, 2015
1634:"uBlock 0.9.5.13"
1450:"Release 0.9.3.0"
1271:chrome.google.com
1188:on March 24, 2020
664:WebAssembly Usage
461:-based browsers.
279:content filtering
275:browser extension
228:
227:
193:Browser extension
2659:
2588:
2581:
2580:
2578:Official website
2564:
2563:
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2369:
2363:Make Tech Easier
2354:
2348:
2347:
2345:
2343:
2337:rootmygalaxy.net
2328:
2322:
2321:
2319:
2317:
2308:. Archived from
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2284:
2278:BleepingComputer
2270:
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2259:
2253:BleepingComputer
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2074:Business Insider
2071:
2066:O'Reilly, Lara.
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1769:. April 25, 2015
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1588:on July 19, 2018
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1549:
1543:
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1523:
1517:
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1513:
1506:Update README.md
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1247:on July 22, 2017
1243:. Archived from
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1204:
1198:
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1184:. Archived from
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1006:"Release 1.59.0"
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672:Chrome Web Store
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611:CNAME Uncloaking
543:link prefetching
349:HTTP Switchboard
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2312:on June 9, 2015
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1865:Windows Central
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182:72 languages
179:Available in
113:30 July 2024
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67:Raymond Hill
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59:Developer(s)
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2342:October 28,
1815:January 21,
1794:January 21,
1723:January 20,
1696:December 4,
1671:December 4,
1618:December 4,
1592:December 4,
1562:December 4,
1537:December 4,
1512:December 8,
1488:December 4,
1479:vs. uBlock"
1459:December 8,
1433:October 17,
1411:October 17,
1385:December 4,
1357:December 4,
1328:December 4,
1251:December 4,
1218:December 4,
1192:December 4,
1161:December 4,
1135:December 4,
1113:December 4,
1091:December 4,
1031:Crowdin.com
990:December 4,
963:December 4,
763:Thunderbird
668:WebAssembly
591:style sheet
574:Performance
502:hosts files
498:EasyPrivacy
451:ad blocking
447:Manifest V3
353:block lists
283:ad blocking
2596:Categories
2538:August 18,
2533:github.com
2508:github.com
2394:August 26,
1988:"uBO Lite"
1748:October 2,
1743:github.com
1691:github.com
1582:ublock.org
1557:github.com
1532:github.com
1483:Github.com
1352:ghacks.net
1212:github.com
938:References
606:browsers:
457:and other
161:JavaScript
157:Written in
127:Repository
88:2014-06-23
2233:March 20,
2158:August 3,
2133:April 26,
2105:April 25,
2079:April 25,
2051:April 25,
1773:April 25,
1739:"uAssets"
1317:"uMatrix"
769:SeaMonkey
731:(desktop)
725:(desktop)
719:(desktop)
686:IndexedDB
365:extension
343:from the
311:Pale Moon
2208:June 13,
1958:June 13,
1952:Archived
1921:Archived
1646:June 26,
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1208:"uBlock"
1011:July 30,
887:/gorhill
857:NoScript
821:See also
803:EdgeHTML
717:Chromium
642:replace=
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587:web page
493:EasyList
473:Features
459:Chromium
372:comScore
345:codebase
291:Chromium
220:/gorhill
140:/gorhill
64:Current:
2368:May 27,
1897:July 9,
1841:May 28,
1036:May 16,
751:Firefox
555:pop-ups
515:iframes
467:Firefox
424:Mozilla
395:AdBlock
361:release
341:forking
326:History
299:Firefox
222:/uBlock
211:Website
200:License
142:/uBlock
111: (
86: (
2559:GitHub
2439:GitHub
2203:GitHub
2183:May 5,
2153:GitHub
1993:GitHub
1717:GitHub
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1322:GitHub
1085:GitHub
1060:GitHub
984:GitHub
958:GitHub
909:Safari
883:github
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783:WebKit
640:: The
547:WebRTC
420:Ubuntu
418:9 and
416:Debian
407:uBlock
331:uBlock
315:Safari
287:Chrome
216:github
136:github
1948:ZDNet
868:Notes
746:Gecko
729:Opera
723:Brave
708:Blink
689:data.
307:Opera
303:Brave
270:-blok
205:GPLv3
70:Past:
2540:2019
2515:2017
2472:2015
2446:2024
2421:2015
2396:2015
2370:2017
2344:2017
2318:2015
2285:2020
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2160:2024
2135:2024
2107:2024
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1960:2019
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1899:2021
1872:2016
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1775:2015
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1038:2024
1013:2024
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965:2019
926:for
907:for
885:.com
496:and
431:fork
295:Edge
277:for
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539:DOM
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