After recent IME work landed, we don't dispatch composition events, but we depend on that in FormAssistant to show autocomplete suggestions.
Alex - Can you see if we should still be firing composition events. If not, should we be firing other key events and/or input events?
We do fire the NS_TEXT_TEXT event, but there is no corresponding nsIDOM* object, so it's visible as a simple UIEvent in JS. I've been looking at an option to fire composition events. They trigger some input handling logic, which causes unwanted side-effects with this new approach. I'll make another try, as apparently composition events are important.
Created attachment 583347 [details] [diff] [review] Fix This patch fixes the issue. I don't really like this approach - it causes NS_COMPOSITION_START and NS_COMPOSITION_END events to be sent on every character, but it works, so can be used, at least as a short-term solution. I'll continue looking into this.