When i drag and drop the attachment in Gmail, it starts downloading instead of uploading. It happens to all file types Issue only with e10s, works fine in Normal Firefox Nightly Screenshot e10s Not accepting the Drag and Drop => http://f.cl.ly/items/3P0G232b3j1A2M3e2q2p/Firefox_Nightly_e10s_1.jpg Started to Download the attachment => http://f.cl.ly/items/3m0T0b150Y0L0o31153w/Firefox_Nightly_e10s_2.jpg Normal http://f.cl.ly/items/1U12151B1C1e2n2g2t1e/Firefox%20Nightly.jpg System Info: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.9; rv:33.0) Gecko/20100101 Firefox/33.0 ID:20140617030203 CSet: bb35d1b73634