Quickly documenting some different behaviors when reading articles on the Washington Post:
1. Firefox 42.0a2, Tracking Protection turned on: article obscured, "To keep reading, please enter your e-mail address."
2. Firefox 42.0a2, Tracking Protection turned on, private browsing mode: article obscured, "Your ad blocker is on."
In both cases, it asks for an email address to continue. In both cases, the email submission form fails to work with a vague error message when I enter a mailinator.com address. With a spam GMail address (that is, including "+spam"), WaPo thanks me and lets me click through to the article.