I use a host company : http://www.gogvo.com/affiliates/stats.php? & when i try to copy & paste any text in OPT_IN message , Firefox gives me this message: Copy/Cut/Paste is not available in Mozilla and Firefox. Do you want more information about this issue? & i tried to solve it with this : , but it does not work Changing the preferences in Firefox 1.Quit Firefox. If you have Quick Launch running (on Windows, this is an icon in the toolbar), quit that too. 2.Find your Firefox profile directory. 3.Open the prefs.js file from that directory in a text editor. If there's no prefs.js file, create one. 4.Add these lines to the prefs.js file: user_pref("capability.policy.policynames", "allowclipboard"); user_pref("capability.policy.allowclipboard.sites", "https://www.mozilla.org"); user_pref("capability.policy.allowclipboard.Clipboard.cutcopy", "allAccess"); user_pref("capability.policy.allowclipboard.Clipboard.paste", "allAccess"); 5.Change the url https://www.mozilla.org to the site for which you want to enable this function. 6.Save the file and restart Firefox. The Clipboard buttons should now function.