protected function _addExtensions(\OxidEsales\Eshop\Core\Module\Module $module)
    {
        $needFix = $this->checkExtensions($module, $aModulesDefault, $aModules);
        if ($needFix) {
            $this->needCacheClear = true;
            $onlyInAfterFix = array_diff($aModules, $aModulesDefault);
            $onlyInBeforeFix = array_diff($aModulesDefault, $aModules);
            $this->output->info("fixing " . $module->getId());
            foreach ($onlyInAfterFix as $core => $ext) {
                if ($oldChain = $onlyInBeforeFix[$core]) {
                    $newExt = substr($ext, strlen($oldChain));
                    if (!$newExt) {
                        //$newExt = substr($ext, strlen($oldChain));
                        $this->output->debug(" remove ext for $core");
                        $this->output->debug(" old: $oldChain");
                        $this->output->debug(" new: $ext");
                        //return;
                        continue;
                    } else {
                        $this->output->debug(" append $core => ...$newExt");
                    }
                    unset($onlyInBeforeFix[$core]);
                } else {
                    $this->output->debug(" add $core => $ext");
                }
            }
            foreach ($onlyInBeforeFix as $core => $ext) {
                $this->output->debug(" remove $core => $ext");
            }
            $this->_saveToConfig('aModules', $aModules);
        }
    }