How to obtain data from clipboard in Firefox

Question

I would like to trigger onpaste event on element to retrieve data in clipboard (I want to check if image exists in clipboard and upload it into the server). It works perfect on

Answer 1

It seems not. Sorry.

http://support.mozilla.org/en-US/kb/Granting%20JavaScript%20access%20to%20the%20clipboard

JavaScript get clipboard data on paste event (Cross browser)