How to enable the new In Content Preferences Interface in Firefox 15 Open Firefox browser, type about:config in the address bar and hit Enter. Accept the warning by clicking “I’ll be careful I Promise” warning button. Now start typing “browser.preferences.inContent” (without quote) in the search box to find it. Its default value is ‘false’. Make its value ‘true” by double clicking it.
Note: You can always revert the changes by making its default value ‘false’ by double clicking it again. Close the about:config tab and check the new In Content Preferences interface by going to Firefox – Options (or by clicking the Settings menu from Firefox’s start page). Now, instead of opening in a new window, it’ll open in a new tab interface from where you can make changes to your Firefox. Share your view about this new In Content Preferences interface.
