Mozilla/5.0 (Macintosh; U; PPC Mac OS X; en-US; rv:1.2b) Gecko/20021016 MultiZilla/v1.1.21 see attachment
Created attachment 103730 [details] screenshot showing problem green rings indicate the 4 correct double scroll-arrows red rings indicate the 2 incorrect single scroll-arrows
sounds like bug 56488 about Mac OS 9 and missing arrows
changed the summary to a more general title this is also seen i the following windows: 1) mail composer 2) the window you get when double-clicking on an email I guess it's the same root cause i all three cases :-) But! do you want it split into separate bug-report ???
*** Bug 264147 has been marked as a duplicate of this bug. ***
This only happens in Modern theme...