Tumblr Savior is described as 'Tired of posts about the iPhone filling up your dashboard? Hate hearing about some athlete's latest blunders? If you just want to hide posts about certain topics, Tumblr Savior is here to save you. Just add your most despised terms to the black list and Tumblr Savior will' and is an app in the web browsers category. There are 2 alternatives to Tumblr Savior for a variety of platforms, including Windows, Google Chrome, Mozilla Firefox, Linux and Web-based apps. The best Tumblr Savior alternative is New XKit, which is both free and Open Source.
A fork (copy with changes) of the original XKit addon, which improves your Tumblr experience. It is comprised with the ability to install more extensions, further adding more features.
It works with tumblr and performs the desired feature. As far as I can tell, these other options don't.