We present the first-of-its-kind user experience study to assess whether browser warnings are effective measures for preventing users from accessing disinformation websites. Current browser warning research has focused on the use of warnings to protect users from malware, phising, and security vulnerabilities. We create warnings in Google Chrome that caution users against disinformation by adapting the existing security warnings, and conduct a laboratory experiment to examine users’ reactions when they encounter disinformation sites. To our knowledge, we present the first in-depth field study of browser disinformation warnings, and their impact on user behavior.