The new, cooler text size menu was removed completely because it broke mac menus. Because Netscape has no branched, we should at least readd the old text size menu so Netscape 6 has *something*. The old text size menu was fully tested for a long period of time, so readding it shouldn't be any problem, and shouldn't cause any risk.
i think this is a dup of bug 53207
Blake, luckily no need for this, see bug 53207 which advocates turning the new menu back on, and bug 52969, which requests turning either version of this menu off until Mac gets working font size code. Technically, this is not a dupe of 53207, so I'll mark it wontfix.
vrfy invalid -- yep; cool