Sure!
In FF, go to the link on the left side of the page that's called "Sharing". Then click on the sub-link that says "Home Page Setup". At the top of this page it will have your home page URL which you'll need to link to.
For example mine is:
http://www.fertilityfriend.com/home/1da096
Go to your JM siggie and type (or paste) the URL for your home page before the [ img] part of your ticker image. Then, you need to cut the [ /url] part of your homepage link and paste it after the [/img] of the ticker image link.
So this is what it will look like (I changed the [ and ] brackets to parenthesis so that the code shows here instead of the images)
(url="http://www.fertilityfriend.com/home/1da096") (img)(http://i23.photobucket.com/albums/b362/1stimettc/siggies/viewchart.png(/img)(/url)