{{as of|2014}}, some websites were setting cookies readable for over 100 third-party domains.<ref name="BYMXD">{{cite web |url=http://webcookies.org/third-party-cookies/ |title=Third party domains |publisher=WebCookies.org |access-date=2014-12-07 |archive-url=https://web.archive.org/web/20141209234746/http://webcookies.org/third-party-cookies/ |archive-date=2014-12-09 |url-status=live}}</ref> On average, a single website was setting 10 cookies, with a maximum number of cookies (first- and third-party) reaching over 800.<ref name="cOnAw">{{cite web |url=http://webcookies.org/number-of-cookies/ |title=Number of cookies |publisher=WebCookies.org |access-date=2014-12-07 |archive-url=https://web.archive.org/web/20141209235956/http://webcookies.org/number-of-cookies/ |archive-date=2014-12-09 |url-status=live}}</ref>
The older standards for cookies, RFC 2109<ref name="RFC2109"/> and RFC 2965, recommend that browsers should protect user privacy and not allow sharing of cookies between servers by default. However, the newer standard, RFC 6265, explicitly allows user agents to implement whichever third-party cookie policy they wish. Most modern web browsers contain [[privacy settings]] that can [[ad blocker|block]] third-party cookies,. and some now block all third-party cookies by default - as of JulySince 2020, such browsers include [[Apple Safari]],<ref name="zw6bb">{{Cite web|last=Statt|first=Nick|date=2020-03-24|title=Apple updates Safari's anti-tracking tech with full third-party cookie blocking|url=https://www.theverge.com/2020/3/24/21192830/apple-safari-intelligent-tracking-privacy-full-third-party-cookie-blocking|access-date=2020-07-24|website=The Verge|language=en}}</ref> [[Firefox]],<ref name="GSofz">{{Cite web|date=2019-06-04|title=Firefox starts blocking third-party cookies by default|url=https://venturebeat.com/2019/06/04/firefox-enhanced-tracking-protection-blocks-third-party-cookies-by-default/|access-date=2020-07-24|website=VentureBeat|language=en-US}}</ref> and [[Brave (web browser)|Brave]].<ref name="sUPt1">{{Cite web|last=Brave|date=2020-02-06|title=OK Google, don't delay real browser privacy until 2022|url=https://brave.com/ok-google/|access-date=2020-07-24|website=Brave Browser|language=en-US}}</ref> block all third-party cookies by default. Safari allows embedded sites to use Storage Access API to request permission to set first-party cookies. In May 2020, [[Google Chrome]] 83 introduced new features to block third-party cookies by default in its Incognito mode for private browsing, making blocking optional during normal browsing. The same update also added an option to block first-party cookies.<ref name="xiHRq">{{cite web |last1=Protalinski |first1=Emil |title=Chrome 83 arrives with redesigned security settings, third-party cookies blocked in Incognito |url=https://venturebeat.com/2020/05/19/google-chrome-83/ |website=VentureBeat |access-date=25 June 2020 |date=19 May 2020}}</ref> ChromeAs plansof toApril start2024, blockingChrome postponed third-party cookiescookie blocking by default into late 20242025.<ref>{{citeCite newsweb |last=Amadeo |first=Ron |date=2024-04-24 |title=Google nowcan’t delaysquit blocking 3rdthird-party cookiescookies—delays inshut Chromedown tofor latea 2024third time |url=https://www.business-standardarstechnica.com/articlegadgets/technology2024/04/google-now-delays-blocking-3rdthird-party-cookiescookie-indeath-chromeagain-tonow-latescheduled-2024for-122072800244_1.html2025/ |newspaperaccess-date=Business Standard India2024-04-25 |datewebsite=28Ars July 2022Technica |accesslanguage=en-date=23 September 2022us}}</ref>
