The New York times Website has an annoying feature - whenever one highlights a word, the site popups a window with the dictionary definition of that word. This makes it extremely annoying to read as you ahve to be very careful where on NYT you click the mouse.
Here is how to block this stupid ad:
Run Adblock in mozilla.
Add this to adblock filters: *.nytimes.com/js/common/screen/altClickToSearch.js