Music plays delayed on WebGL build

I built a game on WebGL platform and tested in Firefox and I noticed music is playing everytime after significantly delay. I tried “Best latency”, “PlayScheduled” function and audio clips settings, but nothing fixed an issue. Delay affects only for music, sounds works great. Maybe this is caused by length of a clip, but I’m only assuming.

Anyone fixed this problem earlier?

You are probably encountering this Unity Issue Tracker - [WebGL] PlayScheduled and SetScheduledEndTime have no effect - clip just plays bug which is fixed in a future version of 5.4beta.

Sorry for the troubles in the meantime.