Copy to clipboard with Javascript in Firefox

Looks like this is not supported any more, and there is no replacement :(

https://support.mozilla.org/en-US/questions/977068#answer-500083

Maybe making some noise in a Firefox bug will help us get a (safe) solution.

Solved by creating a Firefox Add-on that exposes the clipboard object: https://github.com/myplaceonline/myplaceonline_ffclipboard

Example:

if (window.ffclipboard) {
  window.ffclipboard.setText("clipboard text");
}