Macos – iterm2 cannot toggle fullscreen when in ‘top of screen’ mode

For web browsers, and specifically for use of sites with behavior that enables or requires use of the Escape key while not preventing closing of full screen (like Stack Exchange sites), you can use the following user script:

// ==UserScript==
// @name           Keep Full Screen
// @namespace     http://superuser.com/q/315949
// @description    Prevents Escape key from leaving full screen.
// @include      http://*
// ==/UserScript==
document.onkeydown = function (evt) {
    if (evt.keyCode == 27) evt.preventDefault();
}

To run this in browsers, use any user script engine for your browser.

• For Safari 5, you can use the Safari extension NinjaKit (on GitHub). This is what I use.
• For Chrome, you can use its NinjaKit variant.
• For any other Safari on OS X, you can use the SIMBL plug-in GreaseKit. Not sure how up to date it is though.

It took me a while to find this tonight, so I’ll respond here since this was near my top search results for how to disable Lion fullscreen mode in iTerm2, and this is probably what many people will be looking for.

1. In iTerm2, open Preferences
2. Select General
3. Uncheck Lion-style fullscreen windows