How to export/import cookies

How come When I go to the search tab on add on to find import/export cookies, I am unable to find it?
When I go onto Firefox’s main page, this is the message that pops up for me: "This add-on is not compatible with your version of Firefox."
Waiting for your response, thank you.

It sounds like that add-on is no longer compatible with Firefox. Have you tried looking for others?