I am actually amazed at how well this works. You do need to follow the reddit search guide pretty closely, but I am now updated on multiple different specific topics at the drop of a hat, within a minute of the post.

I was going to buy the reddit notifier, but with this, I don't think it's necessary.

Edit:

I have edited this review three times now. Just a note to everyone who gets the extension: if you want to use it to search NSFW subreddits, you must be logged in on your browser. If you only log in when you go to incognito mode, it won't work. So as long as you're logged in, it should be fine.