Is it this one or a different one?

https://addons.mozilla.org/firefox/addon/better-twitch-chat/

Sometimes a connection error can be temporary, but if it keeps happening, there might be a problem with a redirect failing.

Try downloading the add-on. Then drop the file into the browser window.

jscher2000 said

Is it this one or a different one? https://addons.mozilla.org/firefox/addon/better-twitch-chat/ Sometimes a connection error can be temporary, but if it keeps happening, there might be a problem with a redirect failing.

No, it's not, It's this one which unfortunately is not in the Firefox add-on section but on its own website https://nightdev.com/betterttv/#

Used to have it a long time ago but I've just reinstalled FF.

FredMcD said

Try downloading the add-on. Then drop the file into the browser window.

I could be blind but I'm pretty sure it doesn't have a manual download otherwise I would.

Zaksjk said

I could be blind but I'm pretty sure it doesn't have a manual download otherwise I would.

I see a huge, green download button   ......

https://nightdev.com/betterttv/#

This is the direct URL to the extension file:

https://nightdev.com/betterttv/firefox/betterttv.xpi

If you right-click > Save Link As, can Firefox download the file?

As far as I can tell, it's a direct download and doesn't redirect (which has caused problems for some users in the past).

(Downloading first was what FredMcD was suggesting in general terms before you mentioned the site you were using.)

Happy112 said

Zaksjk said

I could be blind but I'm pretty sure it doesn't have a manual download otherwise I would.

I see a huge, green download button   ......

https://nightdev.com/betterttv/#

That just tried to download it via Firefox and not to the computer hence the error

Solved the problem by myself, Had to use Chrome to do it ironically, Cheers anyway.