[Q]:CM12 stock browser about:debug not working topic

hi,
I'm new to this forum, and a new happy user of CM12 on my galaxy S2. This is great stuff guys...
I have spent quite a few hours now searching the way to solve my issue, which actually seems pretty easy to fix, but can't find how...
on CM11, my stock browser allowed me to change my UserAgentString.
on CM12 there is no option for this. I tried using "about:debug" to see if menu will change, but.. no, it will not.
so I am stuck on this.
any help will be much appreciated
thanks
Ciao
Neverino