Hello,
i just noticed that iceweasel changes the presentation of its "Preferences" in latest version 36 and it now comes as a modern website in the content area of the browser.
The structure just changes from horizontal tabs to vertical menu items - but i admit, i felt completely lost.
Though i will stay with the new about:preferences presentation, i still appreciate that users have choice to disable it.
So if you prefer the old settings dialog as floating window method:
- open about:config,
- filter for preferences,
- toggle browser.preferences.inContent to "false".
greetings
musca