Very nice extension but twitch probably changed something so that it no longer works at the moment. Hopefully it is possible to fix this.
A Few Moments Later: It works again :-)

Issue seems to be fixed. Thanks. Working awesome

Only thing that works to block all ads and purple screens on twitch right now. The volume is quieter than the default player for some reason, and the latency is a bit worse, but it's a small price to pay.

EDIT: Of course it stops working the day after I send this review. I assume twitch changed something but this extension is broken for me right now.

EDIT 2: Working again 2021/01/25.

This add-on is a life saver! i have a 10mbit connection that is not constant in download.
With this addon i can increase the buffer specifying the goodness of the connection and stream never stop.
Thanks devs! i <3 you

Great player with a lot of thought put into it, but one star ding for lack of pop-out video support via Firefox picture-in-picture. ( https://support.mozilla.org/en-US/kb/about-picture-picture-firefox )

UPDATE: It seems raiding doesn't function correctly, when the twitch channel raids another channel it doesn't swap to that channel's video feed when the first one stops broadcasting. The chat does swap, however.

Awesome add-on. Way more convenient then streamlink and streamlink twitch gui.

Twitch showing splash screens because apparently Jeff Bezos is going broke and really needs the ad revenue from Twitch Affiliates who don't even get a piece of the ad money anyway. Nothing like modding a channel that gets interrupted every ten minutes because twitch wants to have a QQ fest about using ad and tracker blockers.

also confirming to get addon to work again, all you need to do is remove the add on and re-add it.

Could use a way to only replace the player, not the whole tab's content.

Расширение останавливает воспроизведение на блокировку рекламы, даже если реклама на стриме отстуствует.

Very good extension for weak computers and laptops. I have performance issues on default twitch player but with this all works fine.

seems to be blocking ads 12/22 again
(better than nothing but still letting some through)

very nice addon, way less cpu usage & ram when watching a stream ( twitch use WAY too much ) one little thing, it seems like a message "hiding ads" for 15sec made his appearance,and it totaly stop the stream, which is a bit annoying. ( ok for now its unusable saddly as its like stop every 10min for that "hiding ads" thing, no idea what is happening or the reason )

Works great. Only problem is it doesn't join raids. Also a new development that twitch must have released in the past few days. Some streamer channels don't load with the addon and when you manually start the addon, it says The stream has ended. They are live at the time. Update: It's a new DMCA setting that streamers need to enable to stream Amazon Prime videos. So, I don't expect this to get fixed.

better than the official twitch player

The addon works nicely again! When tuning into a stream with ads, it says "Hiding ads" for 15 seconds. But instead of waiting 15 secs I can press [pause] and then [play] again so the stream starts without ads or long waiting time.

edit: I haven't seen a single ad or "hiding ad" since yesterday, I believe. Maybe they're gone completely now?
edit 2: Yes, they are! That's even better. Thanks, great job!

After so many years, they still find a way to beat the twitch algorithm and provide us with an add-free experience. Thank you.

Works most of the time

it was good for 2 weeks, and then now the ads aren't blocked. Ads are back again

How do I use the external player functionality?
I use it to boost the volume. I wonder if the extension can do that aswell.
Also, what about supporting 100% transparency instead of 80% max?
Thanks.