Using Foreground and VisualEditor

If you would like to use the Foreground skin together with the VisualEditor extension you will have to add it to the "$wgVisualEditorSupportedSkins" configuration parameter in your "LocalSettings.php" file after the inclusion of the VisualEditor extension:

PHP 5.4 or later
$wgVisualEditorSupportedSkins = [
    'foreground',
    'vector'
];
PHP 5.3 or earlier
$wgVisualEditorSupportedSkins = array(
    'foreground',
    'vector'
);

Note that in case you are only using Foreground on you wiki you do not need to have 'vector' to the array mentioned here.