FE Plugin wont work

As Plupload’s jQuery UI Widget needs jQuery, jQuery UI and a few other CSS and JS files.

Using multiple JS frameworks or multiple versions of jQuery could cause errors. Please note that other TYPO3 Extensions may include JS files automatically.

Following best practice you should make sure to use only one JS framework and not to use multiple versions like jQuery 1.5 and jQuery 1.7. Another solution could be fallback mechanisms like jQuery’s noConflict option. This is not recommended.

Please note its not needed to use jQuery at all in order to make use of Plupload. Only the Plupload jQuery UI Widget uses jQuery, the Plupload Core is written in native JS. See the documentation for more info.