This paper critically examines users' perceptions of privacy and security in web applications,emphasizing interface design. Drawing on both quantitative and qualitative data grounded inCPM and PMT theories, our research addresses Internet users' concerns regarding onlineprivacy and security. Employing triangulation analysis on survey responses and web-basedobservations, our findings reveal a strong association between users' trust in web applicationsand their visual elements. By providing visual examples of current design practices in oursurvey, we discover some important aspects of effective interface designs. Utilizing IUIPCtheory, we identify how web application interfaces influence users' privacy management,impacting their trust and usage decisions. Notably, some users are subtly prompted to grantpermissions or share personal information through deliberate exclusion of options in thedesign of certain web applications. The approach of this study encourages a criticalperspective on privacy and integrity issues in online settings.