Bug ID 741075: Mobile Firefox on Android 9 in Desktop Mode may be falsely detected

Last Modified: Jul 12, 2023

Affected Product(s):
BIG-IP ASM(all modules)

Known Affected Versions:
13.0.0, 13.0.0 HF1, 13.0.0 HF2, 13.0.0 HF3, 13.0.1, 13.1.0,,,,,,,,, 13.1.1,,,,, 13.1.3,,,,,,, 13.1.4,, 13.1.5,, 14.0.0,,,,,, 14.0.1,

Fixed In:

Opened: Aug 18, 2018

Severity: 3-Major


Clients running Firefox on an Android 9 and selecting 'Request Desktop Site' may have a falsely detected user agent.


Client may possibly get the CAPTCHA challenge, or Device ID functionality may not work correctly.


-- Proactive Bot Defense or Device ID features are enabled. -- Client uses Firefox on on mobile device which is running Android 9, and selects 'Request Desktop Site'.


There is no workaround at this time.

Fix Information

Mobile Firefox on Android 9 in Desktop Mode now functions correctly.

Behavior Change

Guides & references

K10134038: F5 Bug Tracker Filter Names and Tips