Worked great once, but a year ago the dev got mad when asked to design the extension with the same permission standards as other Firefox extensions, and then just stopped working on it entirely. If you must use this, use an older version, but its not maintained any longer and just causes more issues than it solves.

I had trouble with it before, it was just a setting problem. Now it just completely stop me from watching YouTube. Spent a good 10 mins disabling my extensionsto find out which one was the problem. To my surprise, the add-on meant to improve my YouTube experience caused me the most problems on YouTube. I don't know what they did today, but they broke it.

Save yourself the headache and don't use Iridium.

It was great when it came out, and finally it was a working add-on that could reverse your playlist, and then it suddenly died.
Sadly, the author has been occupied that he or she couldn't update/fix this anymore, so... consider this abandoned.

add-on went to shid a year ago when they decided to totally redo the UI and then just stopped updating it

The writer freaked out because he had to follow the rules and then he abandoned this extension. This is mostly malware now.

Needs a LOT of work before I'll ever consider it again. Intrusive constant pop-up asking for money...NO FUCKING WAY. That's why extensions like this exist...we don't want ANNOYING BULLSHIT like that!

21.4.2020/// As of today, Iridium completely breaks YouTube's autoplay. Keeps on giving a "playback error". Forced to disable it for now.

Used to be a 5/5 app until the recent updates which removed all of its functions.
Go back to version 0.2.5 if you want this addon to work properly.

Used to work fine... right now though, it just completly breaks YouTube for me. Not a single YouTube video wants to load while this add-on is active.

No feature of the add on work, it's complete useless

Completely useless.

Disable hight frame rate feature doen't work in both old and new version.

bruh

Edit: Wow, even after all this time the add-on is still useless. Great job.

The creator seems to have rage-quit and removed nearly all of this plugin's features.

It's too bad. When I saw that there was an update to the plug-in I was excited. This was once my favorite plug-in and I was hopeful that it had finally gotten some much-needed love.

Now, there's no bugs, but also no features.

Youtube не працює, якщо відкривати відео з gmail.

Youtube does not work when opening videos from gmail.

Fair warning for anyone thinking about using this addon, it will hold your browser hostage if you ever dare to disable and uninstall it. YouTube will not work even in safe mode if you disable this addon once installed. It's highly suspicious and I recommend that everyone reports it for investigation by Mozilla, as the developer so arrogantly wills us to.