I couldn’t find any other Firefox discord links that still lead to a server so I decided to create my own https://discord.gg/8VKZFux
Hello Reuben and welcome to the community!
As a reference, Mozilla has already an official supported synchronous chat platform over Matrix, where you can find a few rooms dedicated to Firefox where both contributors and staff are present and collaborating:
Can you help us understand the needs you have that are not covered by it? In general we want to avoid the confusion of many channels for the same purpose, specially because we worked really hard to make our matrix server a safe and welcoming space for everyone.