particulares.bancosantander.es - Firefox is an unsupported browser

[emilio]

URL: https://particulares.bancosantander.es/login/

Browser / Version: Firefox 96.0
Operating System: Linux
Tested Another Browser: Yes Edge

Problem type: Site is not usable
Description: Browser unsupported
Steps to Reproduce:
It's a Firefox 100 UA experiment thing. As soon as I disabled that from about:studies the site works again. Otherwise it goes to https://particulares.bancosantander.es/login/navegador-incompatible.html

Seems server-side, so probably needs contact, happy to help there.

Browser Configuration

• gfx.webrender.all: false
• gfx.webrender.blob-images: true
• gfx.webrender.enabled: false
• image.mem.shared: true
• buildID: 20211125095031
• channel: nightly
• hasTouchScreen: false
• mixed active content blocked: false
• mixed passive content blocked: false
• tracking content blocked: false

View console log messages

From webcompat.com with ❤️

[softvision-raul-bucata]

@emilio Thank you for your report. I was able to reproduce the issue on other devices. The page returns an error message regarding the compatibility of the browser with UA set to Firefox 100:

Tested with:

Browser / Version: Firefox Nightly 96.0a1 (2021-11-25) (64-bit)/ Firefox UA 100
Operating System: Windows 10 PRO x64

Notes:

1. Reproducible regardless of the status of ETP
2. Works as expected using the latest build of Firefox Nightly (with the experiment for 100 disabled where applicable):

Moving this to NeedsDiagnosis for further investigations.

[emilio]

I contacted them and they gave me this incidence number: 1013691034

[ksy36]

Thanks for contacting them @emilio.

I've noticed this is happening in Chrome Canary with version 100 as well.
There is an incorrect version detection in one of the js scripts and version is being detected as 10, instead of 100:

This is because two chars are expected in the version instead of three

return n = t.indexOf("/", t.indexOf("firefox")),
                {
                    name: "firefox",
                    version: t.substr(n + 1, 2)
                };

in this function:

var z = function() {
            var t = navigator.userAgent.toLowerCase()
              , e = window
              , n = 0;
            if (t.indexOf("android") > -1)
                return {
                    name: "android"
                };
            switch (!0) {
            case t.indexOf("android") > -1:
                return n = t.indexOf("/", t.indexOf("android")),
                {
                    name: "android",
                    version: t.substr(n + 1, 2)
                };
            case t.indexOf("ipod") > -1 || t.indexOf("iphone") > -1 || t.indexOf("mobile") > -1:
                return n = t.indexOf("/", t.indexOf("android")),
                {
                    name: "ios",
                    version: t.substr(n + 1, 2)
                };
            case t.indexOf("edge") > -1:
                return n = t.indexOf("/", t.indexOf("edge")),
                {
                    name: "edge",
                    version: t.substr(n + 1, 2)
                };
            case t.indexOf("opr") > -1 && !!e.opr:
                return n = t.indexOf("/", t.indexOf("opr")),
                {
                    name: "opr",
                    version: t.substr(n + 1, 2)
                };
            case t.indexOf("firefox") > -1:
                return n = t.indexOf("/", t.indexOf("firefox")),
                {
                    name: "firefox",
                    version: t.substr(n + 1, 2)
                };
            case t.indexOf("chrome") > -1 && void 0 !== e.chrome:
                return t.indexOf("samsungbrowser") > -1 ? (n = t.indexOf("/", t.indexOf("samsungbrowser")),
                {
                    name: "samsungbrowser"
                }) : (n = t.indexOf("/", t.indexOf("chrome")),
                {
                    name: "chrome",
                    version: t.substr(n + 1, 2)
                });
            case t.indexOf("crios") > -1:
                return n = t.indexOf("/", t.indexOf("crios")),
                {
                    name: "chrome",
                    version: t.substr(n + 1, 2)
                };
            case t.indexOf("trident") > -1:
                return n = t.indexOf("/", t.indexOf("rv")),
                {
                    name: "ie",
                    version: t.substr(n + 1, 2)
                };
            case t.indexOf("safari") > -1:
                return n = t.indexOf("/", t.indexOf("version")),
                {
                    name: "safari",
                    version: t.substr(n + 1, 2),
                    completversion: t.substr(n + 1, 8).substring(0, t.substr(n + 1, 8).indexOf(" "))
                };
            default:
                return {
                    name: "other",
                    version: "0"
                }
            }
        };

Lets see if they can address this before Firefox reaches 100, otherwise we can ship an intervention to limit the version to be < 100.

[ksy36]

Filed https://bugzilla.mozilla.org/show_bug.cgi?id=1743445