Some Drive functionality is only supported in Chrome (eg offline Docs). I would recommend remove/disable of Java due to its inherent insecurities. All NPAPI plugins are about to be removed from Chrome and Firefox anyway.

Antarakhedkar said

Some Drive functionality is only supported in Chrome (eg offline Docs). I would recommend remove/disable of Java due to its inherent insecurities. All NPAPI plugins are about to be removed from Chrome and Firefox anyway.

Well, I understad... But, is there no solution for this...??? I mean, can't firefox solve this issue...???

Correct, And It's not just on Google, I have it on Google and MY ISP cloud. Like with Google Drive, it says when using the browser to upload to drag and drop files right in the body of the web page, when you drag a folder and drop it, it says "Firefox Does not support uploading of folders" or something to that effect, Why is that ? it wants me to open the folder and select individual files or basically the same thing, hold CTRL and click all 100 or 1000's of files to upload.. I simply want to upload an entire folder... Call me a moron, but it should be easy...