I'm currently working on a new strategy, I am putting all possible points on energy and stamina, and I am only doing raids that improve Legion dmg. So I hope when the next world raid comes ill do at least 500,000,000 dmg.
Mute the sound from your browser, using the volume mixer. To get to the volume mixer (on Windows 7) click the volume icon in the taskbar, then click "Mixer". Then click the button to mute Chrome/Firefox/whatever browser you're using. Note that this will mute ALL sounds from the browser, so if you're listening to music on youtube or something you won't be able to hear it.