This is a problem with Firefox for Android security policies. Because everything works as expected * in Firefox Desktop Linux * Chrome for Android * pasting text instead of an image in Firefox for Android. I'm trying to paste images in my own web app, in my own Android phone. * I get the "onpaste" event and clipboardData field as described in https://developer.mozilla.org/en-US/docs/Web/API/Element/paste_event. * HOWEVER ONLY in Firefox for Android, and only when I paste an image, both the "items" and "files" lists in the clipboardData field are empty, with length=0. * The app is served from an httpS site with a certificate Firefox for Android recognizes as valid. I didn't find any way to enable clipboard access from the Settings UI for my own site. It would be sad if Firefox ends up pushing users to Chrome because building our own apps gets more difficult in Firefox than Google's walled garden :'(