User Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.9; rv:33.0) Gecko/20100101 Firefox/33.0 Build ID: 20140923222114 Steps to reproduce: I connected an oscillator to the audio context destination and started it for 10s. Actual results: There are clicking noises during playback at random time. It seems you can increase the noises when adding effects, e.g. a gain node with a linear ramp: http://jsfiddle.net/kfd4umtp/ This does not happen e.g. in Chrome. I'm using a 2013 MacBook Air, but also tried on a Windows 7 Toshiba. Expected results: There should not be any clicking noises during playback.

confirming with Firefox32 and windows7

This should be fixed in version 34. It is in my testing, but please reopen if you find otherwise.