And while we're at it, this idea have just come up:
Maybe we should work on having some sort of a general RTL styleguide/spec for common parts and elements that get repeated across Mozilla projects, e.g.
mozilla.org, Firefox OS, Firefox for Android, for iOS etc.. And have some rules of thumb added to it.
Something to help people kick off testing RTL in any of those projects.
For that I've created an etherpad to collect all those details
https://public.etherpad-mozilla.org/p/rtl-styleguideThis is generally an easy task for any native speaker of an RTL script language, so feel free to add your thoughts to the etherpad!