It's was working until recently but stopped now
I'm on Arch Linux.
The problem is evident in Firefox:
-Double clicking in the URL bar: No text highlight.
-Clicking in the Network Manager from the panel: I can't see the highlight when I hover over the options.
In addition in Firefox, I can't see the scrollbar position on the right anymore (I can click in the scrollbar which put me in the correct position in the page, but I can't see the indicator for the location in the page) : http://imgur.com/EbTXCtf
What I've got:
Customize Look and Feel > WIdget: Raleigh
Thanks a lot for your help!
EDIT : Okay, I've installed gnome-themes-standard and choose as widget any other widgets than Raleigh and it solves everything. The raleigh widget theme was the culprit.