tabs2txt – Get this Extension for 🦊 Firefox (en-US)https://addons.mozilla.org/en-US/firefox/addon/tabs2txt/
Download tabs2txt for Firefox. This add-on provides a button to copy the URL strings of all active tabs in a window to a scratchpad, delimit them with newlines, and provides the ability to copy the list to clipboard. The reverse operation is also supported (txt2tabs).