Member Avatar for zeroth

Whenever I try to paste something in a message (either from right mouse button or the menu paste) when I'm using Firefox, I get an error message from:

[Javascript application]
you need to edit your Mozilla config file to allow this action.

I can't find any reference to a Mozilla config file or any option to edit a config file. Plus the right mouse button brings up a different menu from the IE right mouse button menu. I can paste with no problem when I'm using IE.

Any of you Mozilla guys seen this or have a fix?

Thanks,

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Dani AI

Generated

— This is not a Firefox bug so much as a deliberate security restriction. The forum’s JavaScript is trying to use Mozilla’s privileged clipboard APIs (which work in IE) and Firefox blocks those calls by default. When the script requests elevated privileges and the request is denied you get that “edit your Mozilla config file” error.

Quick (but security‑sensitive) workaround:

  1. Type about:config in the address bar and press Enter.
  2. Accept the warning.
  3. Right‑click anywhere, choose New → Boolean.
  4. Name it signed.applets.codebase_principal_support and set it to true.
  5. Restart Firefox and try pasting.
    Only enable this if you trust the site; it relaxes a security restriction that prevents web pages from requesting powerful privileges. Revert the setting to false afterwards if you don’t need it permanently.

What’s actually happening (for admins/devs): the page is calling Mozilla privileged code such as:

try {
  netscape.security.PrivilegeManager.enablePrivilege("UniversalXPConnect");
  // then access Components.classes to read/write the clipboard
} catch (e) {
  alert("you need to edit your Mozilla config file to allow this action.");
}

That pattern will fail for ordinary pages unless the browser is explicitly configured.

Recommendations: use Ctrl+V or middle‑click paste as a safe user workaround, ask the forum admin to remove clipboard access from client JS (better: rely on user-initiated paste), or provide a signed extension if clipboard automation is required.

Member Avatar for zeroth

Hard to believe that with all the Firefox advocates in this forum, nobody has had this problem. Has anyone tried to paste into a message with Firefox?

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