In latest 4.2.3.CR1 selecting "Change to HTML5" option in Browser Engine dialog sometime leads to problems after restart under Linux. It looks really bad because eclipse just disappear, never come back and there is no any trace of problem in logs. For me the reason was bluejeans.*.so files installed as part of BlueJeans. I also remember there was problem reported with google talk plugin.

This should at least be documented in FAQ as known problems. Another more restrictive option is disable this feature for Linux completely.