Editing User-Agent header (section)

=== Browser misidentification ===
Starting with [[Firefox]] 110 released in February 2023,<ref>{{cite web |title=Firefox Release Notes |url=https://www.mozilla.org/en-US/firefox/110.0/releasenotes/ |website=mozilla.org |access-date=8 April 2023}}</ref> [[Mozilla Corporation|Mozilla]] announced it would temporarily freeze portions of the browser's user agent string at version 109. This was done due to several websites incorrectly recognizing a development version of the browser (which identified itself by the string <code>Mozilla/5.0 (Windows NT 10.0; Win64; '''rv:110.0''') Gecko/20100101 Firefox/110.0</code>)<ref>{{cite web |title=www.bestbuy.com - Firefox is an unsupported browser |url=https://github.com/webcompat/web-bugs/issues/115507 |website=github.com |access-date=8 April 2023}}</ref> as the [[deprecation|deprecated]] [[Internet Explorer 11]] (which reports <code>Mozilla/5.0 (Windows NT 10.0; Trident/7.0; '''rv:11.0''') like Gecko</code>).<ref>{{cite web |last1=Schubert |first1=Dennis |title=Freeze 'rv:' segment in the User Agent string to 'rv:109.0' to avoid erroneous IE11 detection |url=https://bugzilla.mozilla.org/show_bug.cgi?id=1805967 |website=bugzilla.mozilla.org |access-date=8 April 2023}}</ref> This version spoofing was stopped for Firefox 120 onwards, as only browsers identifying themselves as 110 through 119 were observed to be affected by the issue.<ref>{{cite web |last1=Peterson |first1=Chris |title=Remove the frozen 'rv:109.0' IE11 UA workaround after Firefox reaches version 120 (desktop and Android) |url=https://bugzilla.mozilla.org/show_bug.cgi?id=1806690 |website=bugzilla.mozilla.org |access-date=8 April 2023}}</ref>