Weird error in Ffx3

[Beartooth]

      Very often (more often than not), when I c&p a URL into
Firefox 3 (under F9), I get an error which might as well be in
hieroglyphics a;

ASSERT: *** Search: _installLocation: engine has no file!
Stack Trace:
0:ENSURE_WARN(false,_installLocation: engine has no
file!,2147500037)
1:()
2:()
3:()
4:epsGetAttr([object Object],alias)
5:()
6:SRCH_SVC_getEngineByAlias(http://www.roanoke.com)
7:getEngineByAlias(http://www.roanoke.com)
8:getShortcutOrURI(http://www.roanoke.com,[object Object])
9:canonizeUrl([object KeyboardEvent],[object Object])
10:handleURLBarCommand([object KeyboardEvent])
11:()
12:([object KeyboardEvent])
13:anonymous(textentered,[object KeyboardEvent])
14:fireEvent(textentered,[object KeyboardEvent])
15:onTextEntered()
16:handleEnter(false)
17:_onKeyPress([object KeyboardEvent])
18:onxblkeypress([object KeyboardEvent])

      Sometimes I then also get the site; sometimes not.
Anybody know what goes on here? I don't even see what to google
for ...

      Btw, it has only recently started to pull this stunt.

-- 
Beartooth Staffwright, PhD, Neo-Redneck Linux Convert
Fedora 8 & 9; Alpine 1.10, Pan 0.132; Privoxy 3.0.6;
nine (count 'em -- nine) different browsers
Remember I know precious little of what I am talking about.