Maximizer is a free utility that brings Full Screen app mode to all Cocoa apps running in Mac OS X Lion 10.7, even if they don’t technically support the feature yet.

Lion is needed, as is the following to get this working:

  • Download SIMBL – SIMBL stands for “SIMple Bundle Loader” and basically allows app and OS modifications to be made in the form of plugins, which is exactly what Maximizer is
  • Get Maximizer from – Uncompress the zip file and drop the .bundle in ~/Library/Application Support/SIMBL/Plugins

You will then need to relaunch any open apps for the plugin to load, but be aware that Full Screen won’t work in some apps as anticipated, if at all.

Is this necessary? That depends on who much you like Full Screen. Quite a few apps don’t support true full screen yet, ranging from Firefox and Chrome to even apps that ship with Lion like the App Store, TextEdit, Address Book, iWeb, Disk Utility, iChat, and many more. Admittedly, some of these apps don’t make much sense to be full screen, but some would be good and just haven’t been optimized for Lion yet. This should hold you over until then.