how do you currently tag filter on Tumblr?

I used to do this with that Tumblr Savior script thing, but it must have gone glitchy at some point without me noticing, because right now when I add stuff to its filter list it doesn't hide the posts.

I'm trying to not be spoiled for the new X-Men movie until I watch it, and I have been just staying away from Tumblr the last few days, but apparently Tumblr has by now become a thing that I have a routine impulse to check. So having a working tag filter again would be helpful.