Browser compatibility
Safari works consistently with the DragNDrop function, whereas Firefox has inconsistent results.
Mac users moving more than 15 files at a time should use the Drag N Drop option via a web-browser connection to WesFiles to avoid a slow transfer issue seen through the Finder.
There’s a Firefox add-on that let’s you specify when to open a site with Safari.
Firefox users can install the Firefox add-on , Safari View, to easily switch between Firefox and Safari, for those times you really need to use Safari, such as when you need the WesFiles Drag N Drop function. You can keep a list of URLs Firefox should always hand off to Safari (you don’t need to keep Safari open).
https://addons.mozilla.org/en-US/firefox/addon/4641