Not supported.
Silently removing support for the only major browser engine outside of the chromium ecosystem is already pretty scummy. Leaving it up on the store without telling users that it is defunct is ridiculous.
Do better Teleparty.

"Install Teleparty" and "Wrong browser"

Not supported on firefox. WHY IS THIS ON THE FIREFOX EXTENSIONS

Netflix on Firefox is very buggy, pausing on second or third try etc, jumping all over the place. Works well on Chrome

Unsupported

Does not work with Firefox.

Broken on some streaming sites, like Prime Video.

Ну такое...

Not sure why people are saying the support has been dropped for Firefox, it's working great, but I'm not sure about HBO as some people seem to be having an issue with this as I don't use this platform, but for Netflix, it's a great tool to allow me and my brother to watch Netflix together, whilst we talk on Discord. Really useful!

The basic add on is nice, good, everything. but what's taking so many stars away is the premium plan which i can't write a review for extra.
Premium makes most of the things of the basic extension just shit or nonexistent anymore.
Yes, you can watch a few more things maybe but...
you can't see anymore if someone is buffering which before was easily visible in chat, the chat is now a seperate window, so you can't even watch fullscreen anymore if you just have one display and still want to see chat, i have to reload the page first every time i make a new party because when i start it first time i can't put the video fullscreen anymore or even click on anything in it!
Sorry, but those are most of the things that make me decide on teleparty, otherwise i could use basicaly any other program or add on that has screen- or videosharing
i could use parsec, teamviewer, discord, or whatever just to name some and it wouldn't cost as much as premium does, but i won't have anything like the "normal" chat
Maybe i'll do that, who knows?
just fix your damn premium teleparty ffs

Always a great way to watch Netflix with friends wherever they are.

Does not seem to sync up with HBO Max

They decided to drop support for firefox.

Worthless piece of garbage. Doesn't work at all

leider klappt prime video überhaupt nicht... netflix funktioniert hier aber ohne probleme... hat noch wer das selbe problem? bei meinen freunden funktioniert es mir prime video in firefox auch nicht... mit einem update ist wohl nicht zu rechner weil das letzte update über 1 jahr alt ist... und das bereits seit mind 4 monaten nicht mehr funktioniert

works for youtube well

very useful :D

Does not work with HBO Max at all. The total video playtime length is different between users so it's totally de-synced. Controls are also very finicky and don't work for one of the people most of the time.