open firefox (a clean instance). This issue might be specific to changes made on Fedora 22+, e.g. using Gtk3 instead of Gtk2.
install this addon and restart firefox
open a second window
bring first window to front (make it get mouse and keyboard focus)
What happens:
On the first window most UI elements become rendered insensitive. Some widgets even become insensitive. This e.g. affects text fields. Input (both mouse and keyboard) sometimes is redirected to the second window.
Steps to reproduce:
What happens: On the first window most UI elements become rendered insensitive. Some widgets even become insensitive. This e.g. affects text fields. Input (both mouse and keyboard) sometimes is redirected to the second window.