This extension caused a critical issue with video playback on certain websites that use CDNs and HTTP Range streaming. After installing it, videos would not load in Firefox in normal mode, showing the error “The media could not be loaded…”, while ads and other content played normally.

In DevTools, media requests returned status 206 (Partial Content), but were marked as “blocked”, indicating that the data stream was being interrupted on the client side. Interestingly, videos worked correctly in Firefox’s private mode, which made the issue harder to diagnose initially.

This behavior suggests that the extension interferes directly with the media playback pipeline (MediaElement/WebAudio), causing conflicts with browser security policies (CORS/ORB) or segmented streaming. After removing the extension, the problem was completely resolved without any changes to browser settings.

Use with caution, as this extension may break video playback on sites that rely on CDN-based streaming or cross-subdomain media delivery.

Works well - when it works. Can reduce frequencies to improve spoken word audio on bad speakers, but does not work with some websites (Discord) and seems to lose the audio device sometimes.

It seems to be good, and then you turn it off, and everything sounds worse. So you think to yourself, "Huh, it must be doing something" - Then you disable the add-in, and everything sounds the same as when it is turned on.

I genuinely cannot tell if this actually improves audio quality or not. Add to it that this actually breaks video functionality on a numerator of different sites that host video content (No, YouTube is not one) - And the downsides of this plugin outweigh the (maybe) benefits.

ON/OFF switch often does NOT work, use preamp to 65%-70%, above u get compression distortions. Overall good EQ, if not spy app. Cheers :)

Equalizer itself works pretty well, but I notice that it breaks audio if the video uses separate audio channels, but that's primarily only an issue if you watch streamers.

Breaks the videos in Steam. Other than that it works well.

Worked Great For 10 Days then quit working.

latest update breaks VK music

tankyou

Good as an equalizer, but it breaks some websites!

I'm sure many people won't realize this is the reason some videos/music don't play on websites like bandcamp or edpuzzle. I definitely didn't until I went through every extension I had, disabling and testing which one caused it.

Good. But it breaks video playback on a number of sites so had to disable it.

it used to work but somehow recently it mutes the whole Firefox

It did break MeWe's playback feature. The icon indicates it is playing back, but the time never moves nor does the audio play. Site works fine with the audio equalizer disabled or removed.

Good idea overall but it has some bugs with playback speed one youtube

It works for most everything i use it for, but makes google classroom unusable. Would love to keep it but can't.