Strange behavior from the 2.0 Next Action filter

It’s great to have the filter back! However, there are still a few tweaks needed:

— In Chrome, the (apparent) “fold it back up” button on the right is a broken image Functions properly, but doesn’t look good.
— In Firefox, I can’t get it to stay down. I click the filter icon, it flickers, and then goes back up, making it completely unusable. I’ve tried numerous times, with hard reloads mixed in. No dice.