Seek the icon Rated 5 out of 5 stars
Finally I found the icon.
At first, even in the customize window the icon was'nt exsist.
I deleted several addons including this yesscript.
And disposed of xpi files in the Extension folder.
Then restart the FF5.0.
Yet yesscript icon didn't appear in the addon bar(=status bar) in the initial state,
but in the customize window (right click at the empty place on the addon bar) I finally met the icon !!!
windows vista SP2