Audio Equalizer for Chrome, Firefox, and Opera provides you with a stylish equalizer that runs right from a browser toolbar popup.
Audio Equalizer is intended to allow for the easy adjustment of audio settings, meaning the balance between frequency components within an audio file in an efficient manner. Audio Equalizer includes some default audio presets depending on the specific type of audio like Club, Rock, etc. It also permits you to define your own format and save it for use later. Don't like something? There is also a reset button that will revert all changes to default.
Audio Equalizer also has a Mono feature, which is an accessibility option for people with hearing problems. When this feature is active, it ensures that you will never miss a word or sound when using headphones - all in all, a nice little add-on for your browser, allowing for easy sound adjustments.