u/TechD1ff

German email service GMX has implemented an automatic redirect after logging in. It used to be a nag screen, now they completely prevent using the service with an active Adblocker.

Steps to reproduce the issue with active uBO:

Open https://gmx.net -> Click the login button and proceed with credentials -> The mailbox shows for a second, then you automatically get redirected to https://www.gmx.net/fairplay/block/?section=adblock-wall, prompting the user to either deactivate the adblocker or use their mobile app.

This has been tested on Firefox 151.0.2 with the latest filterlist updates.

Troubleshooting information:

uBlock Origin: 1.71.0
Firefox: 151
filterset (summary):
 network: 168843
 cosmetic: 49106
 scriptlet: 33441
 html: 3444
listset (total-discarded, last-updated):
 default:
  user-filters: 2-0, never
  ublock-filters: 52382-70, 23m Δ
  ublock-badware: 10312-28, 23m Δ
  ublock-privacy: 4022-2, 23m Δ
  ublock-unbreak: 2825-1, 23m Δ
  ublock-quick-fixes: 477-13, 23m Δ
  easylist: 96232-125, 23m Δ
  easyprivacy: 55782-33, 23m Δ
  urlhaus-1: 22375-10, now
  plowe-0: 3508-1023, now
  DEU-0: 8390-32, now
filterset (user): [array of 2 redacted]
trustedset:
 added: [array of 3 redacted]
userSettings:
 advancedUserEnabled: true
hiddenSettings: [none]
supportStats:
 allReadyAfter: 169 ms (selfie)
 maxAssetCacheWait: 40 ms
 cacheBackend: indexedDB
popupPanel:
 blocked: 8
 network:
  gmx.net: 4
  mam.dev: 2
  ui-portal.de: 2
 extended:
  ##+js(set-constant, adBlockDetectionResult, undefined)
  ##+js(prevent-setTimeout, UABP)
  ##+js(prevent-addEventListener, timeupdate)