When I first saw this posted over at mozilla links, I really didn’t understand what ‘In-Content Preferences’ was. Turns out it is another feature that Mozilla stole…I mean borrowed from Chrome. However, this is going to be a nice change to the Firefox UI. Currently, when you access the Options (Firefox Button > Options > Options) you get a pop-up window where you can make changes to your Firefox preferences. The downside is you can not do anything else with Firefox until you close the preferences window. Starting with Firefox 15, the preferences “window” will be opening in a new tab. The…