This add-on (Audio Equalizer) prevents playback of any video thumbnail that doesn't have audio especially in less popular websites. This can be easily ascertained by simply disabling the add-on (Audio Equalizer) and seeing the problem disappear.

While in private mode with nothing but this add-on (Audio Equalizer) enabled and after the page is fully loaded. Bringing the cursor/touch pointer to a standstill over an 'image' thumbnail will trigger the fetching and playback of 'video' thumbnail.

Afterwards in the developer console (F12) we see the following warning (Yellow Background) generated immediately:

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An AudioContext was prevented from starting automatically. It must be created or resumed after a user gesture on the page.
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I would like to point out that I have had already changed the Autoplay permission in Firefox's privacy setting page (about:preferences#privacy) for all websites from 'Block Audio' to 'Allow Audio and Video' Before Installing this add-on (Audio Equalizer).

Above warning is then immediately followed by the error (Red Background) below:

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Uncaught (in promise) DOMException: The fetching process for the media resource was aborted by the user agent at the user's request. inject.js:97

attach moz-extension://[ADDON-UUID]/data/content_script/page_context/inject.js:97
attach moz-extension://[ADDON-UUID]/data/content_script/page_context/inject.js:86
moz-extension://[ADDON-UUID]/data/content_script/page_context/inject.js:135
EventListener.handleEvent* moz-extension://[ADDON-UUID]/data/content_script/page_context/inject.js:133

attach moz-extension://[ADDON-UUID]/data/content_script/page_context/inject.js:97
forEach self-hosted:160
attach moz-extension://[ADDON-UUID]/data/content_script/page_context/inject.js:86
moz-extension://[ADDON-UUID]/data/content_script/page_context/inject.js:135
(Async: EventListener.handleEvent)
moz-extension://[ADDON-UUID]/data/content_script/page_context/inject.js:133
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I tried to use the ON/OFF button in the add-on (Audio Equalizer) from its own popup so that the add-on (Audio Equalizer) remains enabled in Firefox but doesn't try to inject the following script which is the source of error ( into the page:

moz-extension://[ADDON-UUID]/data/content_script/page_context/inject.js

However probably thanks to Audio Equalizer's 'Access your data for all websites' permission, Unless you disable the add-on (Audio Equalizer) from inside the Firefox's add-on page (about:addons) the script will still get injected and thus no video thumbnail playback.

I even tried adding 'moz-extension://[ADDON-UUID]' to uBlock Origin's "My filters" and "My rules" tabs based on each tab's correct syntax while removing 'moz-extension-scheme' from "Trusted sites", nevertheless Firefox would still inject the script into the website so long as the add-on was enabled despite "ON/OFF" button being gray (presumably indicating an 'off' state) rather than black (presumably indicating an 'on' state) according to its own popup menu.

As it's not properly programmed to handle audio-less videos and there is no way included to prevent itself from activating on user-defined specified websites (say by actually having an options tab that comes with a configurable exclusion list inside add-on's Firefox page rather than its popup with its ineffective "ON/OFF" button); I believe that the badge granted to this add-on by Mozilla Foundation is without merit and should be revoked.

After all the following is a direct quote from hovering over the badge of each add-on recommended by Mozilla Foundation:
"Firefox only recommends extensions that meet our standards for security and performance"

Extension keeps a power request alive in Windows even after video/audio has stopped, preventing the system from sleeping and automatic shutdown.

doesn't work with Spotify's web player

It works, but sometimes plugin breaks audio on some sites and not working.

latest update breaks VK music

I liked this initially, it worked well as an equalizer. Unfortunately it made YouTube music run like a dog so had to disable it

Stopped working for me on Twitch in Firefox 102.0

As already mentioned in other reviews. This plug in has one major flaw: it blocks some videos.

Works, but some players are unavailable when activated like google player or twitch clips player

After I installed this add-on, I can't change playback speed on youtube.

good but breaks certain websites

Bugs

interferes with the video playback in youtube. You cannot speed up or slow down youtube videos if this extension is enabled.

1) HTML5 Videos published with the JWPlayer can't be played (JWPlayer error code 224003),
2) would be nice to have further presets, e.g. enhancing spoken words.

I would give four stars when there is no interference with JWPLAYER.

Not working on NETFLIX videos, please check...

Good addon. But it has one critical bug which destroys all advantages of this addon for me.
It breaks the speed control for playback on all sites.

😒👉This extension is interfering with google pronunciation/translation and no audio..!!👈😒

The problem with this add-on is that it disables the play back speed control on YouTube.. I have to disable it when I need to watch something at higher or lower speed on YouTube.

It makes all the gifs stop playing.

Brakes youtube speed options.

Although the mono feature I got this for works, it breaks the HTML5 speed controls such as built into YouTube or from the Global Speed extension.

Crap. The window does obstruct part of the interface and the window isn't resizable.

The equalizer works very well. However, I do not know what is the reason that after installing this add-on I stop playing movies on the pages (they only play on you tube and facebook). If you correct it, it will be the best addition in this category