Thread:Extension talk:MobileFrontend/MobileFrontend and $wgUseFileCache/reply

Solved by changing MobileFrontend.php: $wgHooks['HTMLFileCache::useFileCache'][] = 'onHTMLFileCache_useFileCache'; to: $wgHooks['HTMLFileCache::useFileCache'][] = 'MobileFrontendHooks::onHTMLFileCache_useFileCache';