Audio Equalizer Plus by 789Win

Audio Equalizer is a lite extension that let you easily adjust audio settings (the balance between frequency components in an audio file) from a toolbar popup.

There are several audios presets available to choose from in the preset list. For example, you can choose, pop, club, party, soft rock dance, or any other preset format for the audio stream. Please note that you can also define your format and then save it for later use in the toolbar popup. There is also a - reset - button to revert all changes to the factory setting.

Note: this add-on has a Mono feature. Mono is an accessibility feature for people with hearing problems (i.e. deaf in one ear). When this feature is active, you will never miss a word or sound when you are listening to audio from headphones.