TabKeyInserter

By default, pressing the tab key changes focus from the textarea. This scripts makes the tab key produce a tab character instead, which might be necessary for some coders who prefer indenting by tabs. The script runs only on pages ending with .js or .css. This script also includes UnsafeScripts automatically.

Installation
In order to use this, put it in your w:Special:MyPage/global.js or wiki's Common.js. A helpful guide can be found here. Follow the following instructions: