For applications where you want a quick upload to a private Wiki this extension might be a '''much''' better alternative. It has less complexity (and thus less bugs), it does not require editor integration, the workflow is much faster and the UI is lean. It might be worth checking it out.
https://github.com/j-yun/mediawiki-extension-QuickUploadZone
I see an extension which is far more likely to have security issues than this one: it's only had three commits, there's a single fork which appears to have been created by accident, there are no reported issues, and there's virtually no documentation. The presence of a minified JS file (modules/clipboad.min.js) without an unminified version available for inspection is suspicious as well.