Hello everybody! I've created a year ago with the theme (https://support.mozilla.org/en-US/questions/1040730) of this issue. But the decision, which it was offered to me - did not help. And still does not work ctrl + v with images in dialogues vk.com. It is impossible in the new version to fix this? Browsers based on Chromium (Google Chrome, Opera, etc.) is inserted into the image on ctrl + v in the dialogues VKontakte normal. https://bugzilla.mozilla.org/show_bug.cgi?id=891247 Another would did show file upload process on the server. On older versions of Firefox it worked very good extension UploadProgress (https://addons.mozilla.org/ru/firefox/addon/uploadprogress/), but it has not been updated for a long time and now is not working in the latest versions of Firefox (my version 47).