600% Sound Volume (ads/tracking removed) v1.5.4
This addon is a copy of https://addons.mozilla.org/en-US/firefox/addon/600-sound-volume/ with ads/tracking removed since the author blatantly lies in their privacy policy. (The original addon always fetches a list of domains from https://ad.resourcefulman.net/banner/ad-locations.txt, and attempts to fetch an ad banner from https://ad.resourcefulman.net/banner?ref={DOMAIN} when the user visits a domain listed in the obtained ad-locations.txt list; It also ALWAYS injects an iframe with the adbanner if the user is on a supported page, but only shows it if the user permits it).
Additionally, this version is actually open source