Unlike a lot of these copy link as markdown/text/html/etc. extensions, this one actually works. However, the permissions it requests are very broad, and you can't opt-out of the data monitoring option. Ideally all it should need access to is the browser tab and clipboard.

Even more powerful than XUL CoLT, and good icon.

Edit: Unnecessary and meaning-unknown pop-up dialog by default, which makes it inconvenience to use.
And no option to copy link title in text only.