"Twitch Live" (by Tibi) is by far the best Twitch "Go Live" notification add-on/extension for any of the major browsers, and I should know, I have tried them all.

It has the most informative (and clean) interface of any add-on of this type, in my opinion. It does exactly what I needed without doing too much. I just needed a tool that lets me click to see who is live, what their title is, and how long they have been live. This is one of the few Twitch monitoring extensions that actually say the live time, but I find it SO useful! I like to know where a streamer is in their stream, whether I am catching it right at the beginning, or maybe 45 minutes in after all the normal introduction & life update stuff, or to know if a streamer that always uses "Starting Soon" screens is likely still in their mandated 10-20 minute starting soon screen which was so annoyingly common for a while (and incidentally why using normal "notify RIGHT when going live" wasn't as useful for a while).

It is also nice that this add-on shows the number of current viewers, which pretty much all of these types of extensions do, although I do not personally find that information useful since the same streamers always have approximately the same number of viewers, although some people might find that info important i'm sure. I also like that it gives the option to show a thumbnail from the current stream, which helps with determining whether they are still in their "Starting Soon"/"BRB" screens or if they are doing something out of the ordinary like participating in an IRL stream or more benign like reacting to videos.

I also found it super useful to categorize streamers using the add-on in the past, but after losing all my categories & associated channel assignments in a new browser installation, I opted to not spend the time again and just began sorting by "Access Count" and it has been working pretty well to prioritize the streamers I watch most toward the top of the list, although this method has a slight issue with prioritizing people who are online every day, and streamers who are on less often do not get clicked as often and appear lower, but it's a minor inconvenience that would be easy to solve by just putting those rarer streamers into their own category and relying on access count for the rest.

ONE LAST TIP (for new users of this add-on with hoarding issues like myself)... Since I follow so many channels (approx. 400 or so), way more than I regularly watch or need to be notified about on a daily basis, I cannot really use this tool with my primary account. Checking 400 channels so often creates far too much network traffic (and thus lag) to actually be usable, and even if it were perfectly optimized, it is still far too huge a list to sift through to see if my top favorite streamers are online and doing anything interesting. So my solution was to create a secondary account, and just follow all my top favorites that I want to be notified about on that account. This made it so much easier moving forward, and I just need to log out of my primary account and into that 2nd account whenever I need to refresh the auth token for Twitch Live (like once per month). It also significantly reduced the lag I was experiencing from the extension at the time, since now it only checks for information from the much smaller number of channels I want to prioritize being actively notified about.