brave/brave-browser

Browser isn't supported by MRBS

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#43,308 opened on Jan 15, 2025

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OS/DesktopOS/Linuxhelp wantedneeds-investigation

Description

Description

I am running Brave v1.73.104 and NixOS 25.05. The dotfiles for my system can be found here: https://github.com/Gooxey/dotfiles (The error will happen on both the kraken and squid config)

On interactions with the website https://merry.ulb.uni-bonn.de/mrbs_ulb/web/index.php I get the error Unfortunately your browser isn't supported by MRBS. You will need to upgrade to a more recent version, or else use another browser.

Steps to reproduce

  1. Run NixOS with the config found here https://github.com/Gooxey/dotfiles (kraken or squid profile)
  2. Open Brave and go the website https://merry.ulb.uni-bonn.de/mrbs_ulb/web/index.php
  3. Click on any day of the Calender on the right or on the Today button at the top or on any of its next/prev buttons.

Actual result

On interaction with the aforementioned website, pure HTML without any CSS got rendered with the error (under the first picture and link) Unfortunately your browser isn't supported by MRBS. You will need to upgrade to a more recent version, or else use another browser.

Expected result

The page should display as normal. I had the expected results when using Firefox.

Reproduces how often

Easily reproduced

Brave version (brave://version info)

Brave: 1.73.104 Chromium: 131.0.6778.204 (Official Build) (64-bit) Revision: 215b794a7c1f3e28151d0f7712e32c71be48775c OS: Linux

Channel information

  • release (stable)
  • beta
  • nightly

Reproducibility

  • with Brave Shields disabled
  • with Brave Rewards disabled
  • in the latest version of Chrome

Miscellaneous information

No response

Contributor guide

Tech stack
javascripthtmlcss
Domain
frontend
Issue type
bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-3 hours
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
fresh
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
clear
Prerequisites
Understanding of browser user agent stringsBasic JavaScript debugging
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
50
Research direction
Investigate why Brave triggers the 'browser not supported' error on MRBS. The issue likely stems from browser detection scripts on the website. Compare Brave's user agent string with Chrome's, as MRBS may rely on user agent parsing. Check if Brave's shields or privacy features alter navigator properties. Examine the website's JavaScript files for feature detection logic. Reproduce the issue with debug tools and identify the specific check that fails.