Web storage security leads to the stability of web applications upon unauthorized access to data, whether in transit, handling, or storage, and facing denial of service to authorized users, which means the actions needed to identify, record, and counter such attacks. Due to the inherent dynamics of the underlying autonomous management domain and the ever-evolving security requirements, implementing security in the Web situation is a challenging job. The security browsers represent the level of trust in system security. This is has led to the urgent need for an encryption process for these personal accounts on the browser page, because intruders are working to steal these accounts, in addition to trying to penetrate accounts, either for material or personal purpose. What has been worked on in this thesis is made an extension layer on chrome browser used the user's key encryption. The RSA algorithm was used as it is one of the strong encryption algorithms in the current era. Where a 2048-byte encryption key was used, the aim of increasing is the strength of the encryption. Finally, this thesis tested the experiments by applying the model on the experimental application and WhatsApp application.