Работал примерно до ноября 2012 года, затем Mozilla уничтожила его обновлением. Теперь у меня есть обходной путь: откройте новое окно с содержимым для копирования внутри.
Спасибо Мэтью Флашену за идею DataURL (https://stackoverflow.com/a/3665147/1120146)
/**
* To use the clipboard from Mozilla / NS / Firefox:
*
* Clipboard access works only up to Firefox 14 :-( (thanks to those security fanatics)
*
* Solution for later versions: Window pops up with text inside (data url)
*
* In "about:config" :
* set signed.applets.codebase_principal_support = true!
*
* @param text: The text which shold be copied to clipboard
* @param fallbackContentType: The content type of the text, if clipboard access
* doesn't work, i.e. "text/csv"
* default: text/plain
*/
function toClipboard(text, fallbackContentType) {
var success = false;
if (window.clipboardData) {
// the IE-manier
window.clipboardData.setData("Text", text);
success = true;
}
else if (window.netscape) {
if(netscape.security.PrivilegeManager != undefined) {
netscape.security.PrivilegeManager.enablePrivilege('UniversalXPConnect');
var clip = Components.classes['@mozilla.org/widget/clipboard;1'].getService(Components.interfaces.nsIClipboard);
var trans = Components.classes['@mozilla.org/widget/transferable;1'].createInstance(Components.interfaces.nsITransferable);
if(typeof(clip) == "object" && typeof(trans) == "object") {
trans.addDataFlavor('text/unicode');
var stingSupporter = Components.classes["@mozilla.org/supports-string;1"].createInstance(Components.interfaces.nsISupportsString);
stingSupporter.data = text;
trans.setTransferData("text/unicode", stingSupporter, text.length * 2);
var clipid = Components.interfaces.nsIClipboard;
clip.setData(trans, null, clipid.kGlobalClipboard);
success = true;
}
}
else { // Firefox > v15
// Create Data URL
if(fallbackContentType == undefined) fallbackContentType = "text/plain";
var url = "data:"+ fallbackContentType +"," + encodeURIComponent(text);
window.open(url);
}
}
return success;
}