Unable to paste images in Firefox? Try this.

For a long time my Firefox has refused to paste images into form fields. Pasting text works fine, but pasting images silently fails.

I tried turning off all add-ons, but no luck.

The solution, in my case:

1. Navigate to about:config
2. Ensure dom.event.clipboardevents.enabled is set to true

That's it.

If I understand correctly, setting this value to true does give websites the power to intercept copy/paste actions to, for example, prevent copy/pasting into password fields. Some people also report issues with pasting into Google docs.

I haven't encountered any of these side effects, and I exclusively use Chrome for working with Google products. 

For now this solution works perfectly fine for me.