If at some point you need to copy all the web addresses (URLs) from your open tabs to the clipboard, there is a solution. It doesn't seem easy to do it automatically, since Firefox doesn't offer any such choice. However, it can be done quickly and easily. You don't even need to install extensions.
Let's see how it works on a Firefox page that has some tabs open:
From his tools menu open Preferences.
In the Preferences window, you will find in the first tab the setting for your Home Page. In the case of the picture below, the box on the home page is empty, so we will lose nothing. If you've saved a home page, when you're finished, you'll have to re-run it.
Now, click on "Use current pages." All tabs URLs that are open in your browser will be copied to the "Home Page" box.
You can copy them from there by selecting them all with Ctrl + A and then Ctrl + C.
When copying the URLs from the "Home Page" you will notice that they are separated by the character "|."
If the addresses you copied are many and the character removal process it seems tiring, we can automatically remove it.
open her (our beloved) free application Notepad ++ and paste the URLs you want to edit.
Follow the path Search - Replace or in Greek Search - Replace
In the first frame you will see enter the character you want to replace (|)
and in the replacement box type 
as shown in the figure below
Immediately then click Replace All or Replace All and you will see the result shown in the above image.
