Recently I tested all audio addons, which were updated during the last 12 months. SoundSphere by dzl is the first choice of those, who want a booster with EQ or only one dev for Firefox and Chromium. Since version 1.3.0 SoundSphere works well with both browsers, the UIs still look the same, while under the skin you get two different addons now. The ambivalent: Permission history shows a lot of back and forth. Not every claim in the change log comes true. For example: Version 1.3.0 promisses improvements with Soundcloud and Bandcamp. But the former always works, while the latter breaks like it used to do. Usually such mess isn‘t trustworthy - in case of dzl it proves the dev to be active. So, I am curious about SoundSphere's next steps. My wish would be more UI-stability (sometimes it flickers). Maybe this review will be updated soon...