eXtplorer is the best web-based File Manager compatible with your Joomla powered website. You can use it to browse folders and files on the server. eXtplorer works just like an FTP (file transfer program) but much easier. You can edit, copy, move, delta files, search, upload, download files, create and extract archives.
eXtplorer has a dynamic directory tree with on-demand loading of subdirectories. You can create new files and directories, and also change file permissions (chmod) and much more through the eXtplorer directory tree.
Best of all, eXtplorer is free to download, install and use. You'll love it.