Unfortunately while I love the premise of this add-on, I've found it interferes with too many websites in making things just not work. For instance, with this addon enabled, you can't see the buy buttons for You've Got Crabs.
I enjoy it but I wish it was more legible. 'v' and 'r' are almost indistinguishable from each other until a side-by-side comparison. The 'b''s don't quite look right either. If the developer could add alternative font options or fix those 3 letters so I can still read the tweets this add-on would be perfect.