When copying some content on a web page, it can happen that the clipboard contai

Question

When copying some content on a web page, it can happen that the clipboard contains more than what is visibly selected.

This is done for

promotional reasons (e.g., an attribution line with link, appended, prepended or even injected somewhere inbetween),
malicious reasons (see for example the proof of concept that you should never copy-paste from website to terminal),
spam prevention reasons (e.g., for protecting an email address),
etc.

In the 25C3 talk "Tricks: makes you smile" (demo), it was called WYSINWYC (What you see is not what you copy).

I

Explanation / Answer

In firefox urlbar:

type in about:config and press enter.

Then try this: type in dom.event.clipboardevents.enabled in the bar below the url bar, and set to false by double clicking on the true.

This should disable clipboard manipulation.

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