Installing Personal Extension

I have seen many topics about creating your own extension and uploading it to Mozilla for approval but not publishing it so that you can use it yourself only, but none of them tell you what to do after your extension has successfully passed review. I would like to install the extension that I created (and can see in the "My Add-ons" area of mozilla.org), but I have no idea how to do that. Do any of you have any experience with this? This extension was previously only for Chrome but I made some changes to make it Firefox compatible, and I don't want to publish it since it's technically someone else's work. Thanks.