Hello and thanks in advance for any help/assistance. I'm trying to up load a fairly complex set of folders with emails from my old Windows Live Mail system to Thunderbird which I have downloaded I have all the folders stored and accessible and have downloaded importexporttools-3.3.0-sm+tb.xpi To load this I have gone into add-ons on my Thunderbird system. I am told via the Mozarilla website that I need to click on the cog symbol on this page to begin the installation process. But I'm unable to locate that icon on the add-ons page (copy shown below) So, any help in locating this icon would be greatly appreciated. Many thanks