The URL Lister add-on for Firefox gives you the ability to grab all the open tabs you have, and collect them as a series of links, formatted in three different formats, so that they can be copied easily.
To use, all you need to do is right-click on one of the tabs, and select URL Lister. Next, you will see a box (like the one above) that will give you URLs (one per line) for each tab you have open. This makes it super easy to copy and save the links for later. You also have the choice to save the list as plain text URLs, a HTML coded list (for use in a web page), or a Linked List, which would give you the list of links with both HTML code around them an the traditional “list” HTML tags too.
This extension will also open a number of links. So if you have a list of links you need to open in bulk, paste them into the text box, and hit the “OK” button. After doing so, you should have each URL open up in its own tab.