This is a follow-up report for bug 595965 comment 45. This is a problem in the way we currently handle app tabs - we cannot stack app tabs in the correct direction for RTL users - for more details read the linked comment.

post-Fx4

It is *NOT* okay for us to knowingly land a patch which breaks the RTL UI, and make plans on fixing the regressions in a future release. The RTL UI should be treated as first class citizen, same way as LTR UI, and anything broken in RTL mode is reason enough that it can't land on mozilla-central until the problem is fixed. I'm going to dupe this against bug 595965 itself, as the RTL issue needs to be addressed there.