Probably the one that most seemed like a potential for the list was
https://bugzilla.mozilla.org/show_bug.cgi?id=366797 ( Revise the Location Bar )
which seems to cover not showing unreadable URLs in the address bar, like:
http://uk.wikipedia.org/wiki/%D0%92%D1%96%D0%BA%D1%96%D0%BF%D0%B5%D0%B4%D1%…
... and instead showing stuff like:
http://uk.wikipedia.org/wiki/Вікіпедія
(and if that URL gets mangled by some email software, it was a 9 letter Ukrainian
word, written in a non-ASCII alphabet). But the point is, if you spoke Ukrainian,
you could probably read the second version, versus having no hope of reading the
urlencoded version. Of course, there are security concerns about non-ASCII
alphabets that contain characters that look similar to ASCII ones, especially
in the domain name portion, but presumably these can be resolved somehow
(e.g. there's something similar in operation now I think for detecting very
similar looking Wikipedia usernames, including using non-ASCII chars).
All the best,
Nick.
Work on the menu-bar display issue is part of a more general reworking
of some of the IRI / IDN -handling internals of Firefox/Gecko: I'm
involved in some of this...
-- Neil