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.

does not include a voice/speech/podcast equalizer set. no way to import equalizers nor sync them to my firefox account - so re-entering a preset visually on 5 firefoxes after each major firefox upgrade is not sustainable

fine

funciona mal, se escucha más despacio con esto icluso subiendolo al máximo

I'm sorry but... it does not work.
I mean, the control panel is ok, but I have no effect on the audio.

Extra star for always being a reliable option.

Doesn't work on Youtube anymore. Please fix if possible so I can give 5stars rate again.

Audio not in sync with video when used with airplay v1 devices. Bugreport filed.

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.

Great little add-on, works flawlessly. Highly recommended!

Does nothing

Best equilizer for Firefox, but BUGGY! Sometimes no sound, sometimes no video or sound with error "NO VIDEO WITH SUPPORTED FORMAT AND MIME TYPE FOUND" in latter case. (View release notes page on Firefox download page to reproduce). Remedy via right-click whitelist mode, but excruciatingly annoying! Applicable to all Firefox versions, past through latest. Please fix!

This things presets suck... Also there are issues with memory, videos, and sound after prolonged use. Videos would occasionally not load.. then the worst thing happens of it sounding like it is overlapping the audio track on top of itself, slightly offset. Like numerous copies just a second or two different from where they play the same noise as their other copies. It's like the best thing to listen to... it's like watching those old channels you weren't allowed to get on wired cable. Occasionally you see a boob, but was it worth the hours?

Works as intended. Was frying my brain trying to equalize audio in Windows, even though I have a Behringer sound card. Then I remembered there could be a specific app EQ, and found this. Worked imediatelly. My monitor speakers are way to bassy, so this solved the issue . 🙏

When using this extension, an error appears on some videos 'No video with supported format and MIME type found'