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Slack: hide join and leave messages

Removes the system entries about joining or leaving a channel and topic changes so they do not clutter the chat.

Code to copy

/* Hide "joined the channel" / "left the channel" system messages */
.c-message_kit__background:has([data-qa="channel_join_message"]),
.c-message_kit__background:has(.c-message__sender_link[data-qa="channel-leave"]),
[data-qa="channel_topic_change_message"],
.c-message_kit__message--system {
  display: none !important;
}

How to use this example

1. Copy the code with the button above.
2. Install JustZix (2 minutes) and open the extension on the target page.
3. Add a new rule matching that page.
4. Paste the code into the rule's CSS panel and save — the effect appears instantly.