@aeyoun That fix the same in the stable channel? Opera Helper still crashes after changing opera://flags/#proprietary-media-types-playback to default (which is disabled in Stable stream), @aeyoun I can email you the crash report (I have the Apple Problem Report for Opera Helper open in the background (send you the text))
25.0.1614.68 still has the Opera helper crashes (Sent all of the crash reports to Apple) that crashes also happen with a loud buzz from the speakers (any audio that is playing is lowered down before the buzz and then back to normal afterwards)
Also I don't know why the Spelling and grammar is greyed out in the edit menu (on this comment box and in the Desktop team blog comments)