I'm having a hard time finding any recent info on how to add a listener for Ctrl+C, fetching clipboard data, and then writing back to clipboard all in a Chrome Extension. All of the old code that i found was for the older versions that are now deprecated.
Basically you can manipulate clipboard using document.execCommand('paste|copy|cut').
You'll need to specify clipboardWrite and/or clipboardRead permissions in manifest.
clipboardRead Required if the extension or app uses document.execCommand('paste').
clipboardWrite Indicates the extension or app uses document.execCommand('copy') or document.execCommand('cut'). This permission is required for hosted apps; it's recommended for extensions and packaged apps.
Create <input> element (or <textarea>)
document.execCommand('paste')<input> value attribute.This worked for me to copy data to clipboard.
