Copy Link button for the main toolbar (or address bar). Use the right-click context menu to "Copy Framed Page URL". See the full description and screenshots for all the "how to."
Copy Link Button / Copy Frame or Page URL is a Firefox add-on that provides a button to quickly copy the URL of a page. It also allows you to copy the URL of a framed page with just a right-click.
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Just what I was looking for! Simple and functional. This feature should be native to Firefox. Only thing is that the "dark mode" option doesn't seem to work (at least, not in Zen browser).
It works well but the "use black/white icon" option doesn't actually let you select whether you want black or white so it blends in to my browser's background