Found in firefox’s privacy statement

Please note that we’re not yelling at you in this paragraph. Our lawyers have advised us that we need to make sure this information is conspicuous so you’ll read it. The forgery and attack site protection feature is provided “as is” and for your information as advice and guidance only. Mozilla and its contributors, licensors and partners do not guarantee that these protection features will prevent you from being deceived by a malicious website and we strongly recommend that you continue to be vigilant while online, particularly when following links sent to you in e-mail.