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I tried to paste text from another site into my Firebox document, but it says "Firefox does not support Copy & Paste". How do I enable clipboard? I never had problems like this on Firefox before...why?

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I tried to paste text I copied from another site into my Notepad++ (as I've always done in the past with no problem).

But today for the 1st time, I got a message when I tried to paste the text "Firefox does not support Copy & Paste". What?

What happened to the clipboard?

I tried to paste text I copied from another site into my Notepad++ (as I've always done in the past with no problem). But today for the 1st time, I got a message when I tried to paste the text "Firefox does not support Copy & Paste". What? What happened to the clipboard?

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That's a security feature in Firefox.

Use this extension to add the necessary permissions to Firefox - Allow Clipboard Helper:
https://addons.mozilla.org/en-US/firefox/addon/852