Today I watched a short video about how Mozilla is moving from IRC to Matrix by Rubén Martín from Mozilla Reps. The slides are available as well.

As far as I know, this is how the change unfolded:

• 2019-04-26 IRC will go away
• 2019-05-14 explanation of process
• 2019-09-06 four possibilities announced
• 2019-09-12 feedback gathering
• 2019-12-19 decision to go with Matrix announced
• 2019-12-19 welcome from Matrix
• 2020-02-20 we are live

Now the Matrix page in the Mozilla wiki explains how to connect and the fact that federation is enabled.

I found the video and slides above in the #general channel. It seems to be possible to link to a specific message (16:13:11 on 21 Feb 2020 if I have trouble finding it again).

The meta channel to talk about Matrix at Mozilla is called #synchronicity.

Here are some channels that seem to have public logs:

• #general
• #firefox
• #synchronicity