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Disable clipboard manipulations 188.8.131.52-signed No Restart
This extension prevents websites from interfering with your copy and paste actions.
Note: The same functionality is now built into Firefox, you can just change the dom.event.clipboardevents.enabled preference manually.
About this Add-on
cutevents to learn what you are copying or pasting, they won't even know that you do it at all. And they won't be able to interfere to push unwanted content to your clipboard when you copy text.
There are legitimate uses for these events (online editors) but these are irrelevant for most people. It is unlikely that you will ever notice the functionality loss.