Steps to reproduce: 1. Go to "Control Panel", open "Region and Language", click on the "Administrative" tab, click "Change system locale". 2. Change the "Current system locale" to Arabic, then click OK, see https://dl.dropboxusercontent.com/u/95157096/85f61cf7/rw9mfjcoro.png. 3. Click "Restart now" to restart Windows. 4. Open Firefox, then go to https://dl.dropboxusercontent.com/u/95157096/85f61cf7/nusx74cdnd.html. 5. Switch to an Arabic keyboard. The text input cursor should be the left direction with RTL language. Screenshot https://dl.dropboxusercontent.com/u/95157096/85f61cf7/4ihklrswmw.png

Loic, I was just going to change this one and our comment was about to have a mid air collision :D But I was just wondering, won't it be a Component->Event Handling ? Sabbir, can you try with an arabic keyboard ?

It's related about the caret shape in text input, not in the Firefox window.

(In reply to blinky from comment #0) > 5. Switch to an Arabic keyboard. What I mean here is change the language to Arabic by the "Language bar". See https://dl.dropboxusercontent.com/u/95157096/85f61cf7/uelr3qnc82.png

I tested this from Ubuntu 15.04 x64 with latest nightly. The caret flips correctly for English and Arabic languages, Its a windows only.

This will eventually be fixed by bug 1033488. We need to communicate the current keyboard's bidi state to child processes correctly.