Version 108 of Hook integration scripts is now available.
Slack support introduced
It introduces partial support for Slack.
Copy Link command in Hook gets the name and address of the Slack channel or DM. However, it does not provide the address of individual messages.
Version 107 of Hook integration scripts, released earlier today, tweaks the Firefox script, removing the "Mozilla Firefox " suffix that Mozilla added to Firefox 73.0 (64-bit).
Hook customer support/ forum response this week-end may be a bit slow (at least from me).