i made this last night after trying to follow the USOT live thread. it adds a new button on the last page of every thread like this:
https://i.imgur.com/UElrd3X.png
then when you click the button it turns green and starts live updating like this:
https://i.imgur.com/mA8jJl6.png
then all the new posts will just automatically appear on the bottom every 5 seconds, even if they're on different pages of the thread. you can also get desktop notifications like this, which is helpful if you want to follow a live thread but you only have one monitor and you're watching a meet stream in another window:
https://i.imgur.com/Xe2EzKk.png
(if you hover over the notifications they show the full post, and if you click on them they go to the post in question)
LRC supporters club also has a live notifier, but it only checks for posts once every minute (compared to LRC live which checks every 5 seconds) and you still have to refresh the page to see the new posts, plus it doesn't do desktop notifications. i think LRC Live still might be lighter on the LRC servers than the supporters club notifier, because you have to explicitly turn it on / off per thread compared to being always on.
i submitted this as a regular extension for both Chrome and Firefox but it will still be "under review" for a few days. so in the mean time you can install it as a user script, by installing Violentmonkey for Firefox here:
https://addons.mozilla.org/en-US/firefox/addon/violentmonkey/
or for Chrome here:
https://chrome.google.com/webstore/detail/violentmonkey/jinjaccalgkegednnccohejagnlnfdag
then once Violentmonkey is installed you can go here and click the green "install this script" button, then click "confirm installation":
https://greasyfork.org/en/scripts/428178-lrc-live
then you can just go to the last page of any LRC thread and you should see the LRC Live button at the bottom. i've only tested this on Chrome and Firefox so far.
Discus.