See below for details on how to install the Kryon Plugin (HTML connector) for Firefox:

You can install the Kryon add-on from the folder - C:Program FilesKryon StudioFireFox

(For advanced users) install the add-on (xpi file) using the gear icon  in the upper-right area of the Add-on Manager Extensions panel. Select Install Add-on from file... from the menu, then find and navigate to the location of the file, click/double-click on the . xpi file to install.