An extension to add permalinks to GSuite Hangouts chat thread.
Hangouts chat lacks the ability to link to a thread, making it difficult to refer to a particular conversation in a room.
Download from AMO - https://addons.mozilla.org/en-US/firefox/addon/gchat-threadlink/
Technically, this is a webextension, which is supported across browsers. But I've not tested it on other browsers.
MIT