Set Firefox GTK2 Theme

A quick tip to set a default gtk2 theme for firefox menus/radios/buttons (for improved readability)

Edit ~/.local/share/applications/firefox.desktop to have the following lines where required:

...
Exec=env GTK_THEME=mist firefox %u
Exec=env GTK_THEME=mist firefox -new-tab about:newtab
Exec=env GTK_THEME=mist firefox -new-window
Exec=env GTK_THEME=mist firefox -private-window
...