can't "Download firmware" using mobile browser (firefox or chrome)

[altergui]

Expected behaviour

one user (patrick0) wanted to cook and download a firmware using a mobile phone. It could successfully cook, and expected the "Download firmware" button to take him to the binaries directory list, but this last step failed.

Actual behaviour

Tapping on the "Download firmware" black button does show the dropdown listing versions, but then tapping on a specific version makes the dropdown shortly dissapear and appear again. It does not take the browser to the downloads page.

Steps to reproduce the behaviour

I successfully reproduced the bug using Firefox 40.0 on Android 6.0.1
browsed to:
https://chef.altermundi.net/fwprofile/libremeshorg-1607/
then tapped on "Download Firmware", dropdown appears, then tap on "49403 (stable)".