Extension:PersistUseskin

Description
Persists use of &useskin=, if found in query string. Possibly the shortest MediaWiki extension ever (could be seen as one-liner :) ) ... For more, see comments in Code below

Download instructions
Please cut and paste the code found below and place it in. Note: $IP stands for the root directory of your MediaWiki installation, the same directory that holds LocalSettings.php.

Installation
To install this extension, add the following to LocalSettings.php:

Code
If Short urls are used, the following change might be required: