Bug ID 741077: Mobile Firefox on Android 9 falsely detected as Selenium

Last Modified: Apr 20, 2022

Bug Tracker

Affected Product:  See more info
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 get blocked when Proactive Bot Defense is enabled. The 'Classification Reason' will show 'Selenium Detected'.


Client may be blocked or get CAPTCHA challenge. Bot Defense Request Log will falsely show 'Selenium Detected' in the 'Classification Reason' field.


-- Proactive Bot Defense or Device ID features are enabled. -- Client uses Firefox on on mobile device that 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 is no longer blocked due to false detection as Selenium.

Behavior Change