Copy screen picture..
Note that copying PNGs in Firefox is initially disabled. Still, you can enable it by changing your preferences in the browser's configuration settings: just type "about:config" in the browser, search for "dom.events.asyncClipboard.clipboardItem," and switch it from false to true. Once enabled, you should be able to copy assets successfully.
WARNING from the moderator team: Changing Firefox preferences from the about:config page can sometimes break Firefox or cause strange behavior. You should only do this if you know what you're doing. Please read Firefox Advanced Customization and Configuration Options to learn more.
- 1834535 - Sites relying on async clipboard access
- 1809106 - Enable `dom.events.asyncClipboard.clipboardItem` on Nightly
(please do not comment in bug reports