I'm new to FireFox (am falling in love after being a diehard IE user since Win95, although it was buggy, so started with Netscape).
I just added Weather Watcher Live 1.0.18 to the status bar which I can toggle with lCtrl-/. I have an icon there, just not the frog (well, it looks like one to me). I have what looks like a lightening bolt and an NA and when I hover over the bolt, get a blank box. I also went into the Options and added my station (zip code). I looked at https://support.mozilla.org/en-US/kb/what-happened-status-bar#w_where-are-my-add-ons for help.