- Hit the Decline button on a flag
- Select Other... as the reason
- Click inside the text field
Focus will be immediately moved to the Other... radio button, making it impossible to type in the text field.
Note that after selecting Other..., focus is initially moved to the text field. It's only after re-clicking the text field that focus is moved away.
I experienced this problem in Iceweasel 12.0 on Debian Linux 6.0.2. Chromium 6.0.472.63 did not exhibit the same behavior.