280666 2024-09-30 22:51:03 -0700 Add Quirks for changing the navigator.Language because of fingerprinting for logging 2026-04-07 21:37:56 -0700 1 1 1 Unclassified WebKit WebKit Misc. WebKit Nightly Build Unspecified Unspecified RESOLVED FIXED https://bestbuy.com/ InRadar P2 Normal --- 280667 1 karlcow karlcow webkit-bug-importer oldest_to_newest 2064450 0 karlcow 2024-09-30 22:51:03 -0700 When a user is trying to log in on the bestbuy.com website with Safari set as Japanese (Accept-Language: ja) or French-France (Accept-Language: fr-FR), the login is not working. While at the same time this is working for Chrome and Firefox. Also some other languages will be accepted, even things such as French-Canada Safari: PASS Accept-Language: en-US,en;q=0.9 PASS Accept-Language: pt-BR,pt;q=0.9 PASS Accept-Language: fr-CA,fr;q=0.9 FAIL Accept-Language: fr-FR,fr;q=0.9 FAIL Accept-Language: ja Firefox: PASS Accept-Language: en-US,en;q=0.8,fr-FR;q=0.5,ja;q=0.3 PASS Accept-Language: fr-FR PASS Accept-Language: ja We also tried with Safari and overriding the User-Agent to be Firefox. Not working: * Accept-Language: ja * User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:127.0) Gecko/20100101 Firefox/127.0 And it fails on Firefox with a Safari UA override. * Accept-Language: fr-FR * User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/18.2 Safari/605.1.15 bestbuy.com doesn't send a spanish speaking version of the site to users with Accept-Language: es-US,es-419;q=0.9,es;q=0.8 So we can probably test a Accept-Language override in English without issues. In parallel, an outreach effort will be started to contact Best Buy 2064453 1 karlcow 2024-09-30 22:58:09 -0700 <rdar://136235936> 2064474 2 karlcow 2024-10-01 03:08:40 -0700 Outreach effort at https://github.com/webcompat/web-bugs/issues/142261 2197495 3 karlcow 2026-04-06 22:31:32 -0700 I initially though it was Accept-Language, but that's more complex. There is language detection everywhere on the client side. So one solution would be to override the navigator.Language. 2197496 4 karlcow 2026-04-06 22:32:32 -0700 Override navigator.language and navigator.languages to return English values for bestbuy.com. This: Fixes the getBrowserLocale() call returning "ja" → now returns "en-US" Fixes the environment initialization matching "en-US" correctly Fixes the fingerprint hash including the correct language value Fixes all downstream navigator.language reads (analytics, device info, etc.) 2197508 5 karlcow 2026-04-06 23:23:24 -0700 Pull request: https://github.com/WebKit/WebKit/pull/62170 2197867 6 ews-feeder 2026-04-07 21:37:55 -0700 Committed 310760@main (8655616b4d00): <https://commits.webkit.org/310760@main> Reviewed commits have been landed. Closing PR #62170 and removing active labels.