User Agent: Mozilla/5.0 (Windows NT 10.0; rv:53.0) Gecko/20100101 Firefox/53.0 Build ID: 20170504105526 Steps to reproduce: In th addon background script called: document.execCommand(clear) Actual results: the clipboard was not cleared Expected results: The "document.execCommand()" of the API has to be extended by a parameter "clear". This command will clear the global clipboard only from the background script, like the method "emptyClipboard" from the "nsIClipboard" interface with the argument "nsIClipboard.kGlobalClipboard"

Where is document.execCommand("clear") documented? I can't see anything about on MDN. I think you are suggesting we add it? Rather than adding in a WebAPI, I'd rather go with an explicit API to the clipboard API as suggested by bug 134410. If that gets implemented, something like browser.clipboard.clear, would be equivalent (perhaps) to browser.clipboard.set(null) (or whatever the API is). If that's the case, I'd rather dupe this to that bug.

Hi, > I think you are suggesting we add it? thats right. > ... as suggested by bug 134410. I cant see that this bug is in any way related to my report. > If that gets implemented, something like browser.clipboard.clear ... that would be sufficient. For what firefox release do you expect the implementation? Best regards Dipl.-Ing. M. Türschmann

Sorry, I mis-typed the bug number, please see bug 1344410. I'm going to dupe this to that bug. That bug is currently unassigned and looking for a contributor to work on, so there is currently no scheduled plan for that to land.