This is an Extension that allows you to copy and paste without all the fuss. Let's start with the most basic stuff.  It has the ability to copy between the current page and any other page.

It also has an Undo feature. When you select the text, it will place the last selected text in the clipboard. By pressing [Ctrl + Z] you can undo the last selected text, which will remove the highlighted text from the page and place the last selected text back in the clipboard.