Inspired by this feature request, I decided to make this UserScript that allows you to favorite pools and sets.

It's very simple and doesn't require a whole lot of explanation, but first here's how to download:
1. Download tampermonkey for whatever browser you're using.

• Chrome
• Firefox
• Edge

2. Click here
3. Click install

Here's the source code: https://gist.github.com/DontTalkToMeThx/00b47382b7ddc54e01c58a23ef4b7d15

How to favorite/unfavorite?

Go to the set/pool you want to favorite/unfavorite, and click the button that says "Favorite" or "Unfavorite"

Where are my favorites?

For pools: https://e621.net/pools
For sets: https://e621.net/post_sets

Like I said, it's very simple.

I have a bunch of tools listed on my user page. If you have any ideas for a UserScript, send me a dmail. If it's simple enough, I'll probably do it.

You can now hide the favorites list in case it gets too big. This option is remembered, so you won't need to click hide again next time you open the page.