#Clipboard Inserter
A simple addon whose purpose is to automatically insert contents of clipboard into the page.
If you're looking to install this addon, it's available here:
Or, if the links don't work, just search for "clipboard inserter" in the appropriate addon market.
On Chrome, if you want to use this extension with local files (the file:// protocol), you have to enable the "Allow access to file URLs" setting in the extension details.