Worked on expanding security-focused features across the uBlockOrigin/uAssets and polkadot-js/phishing repositories, targeting enhanced protection against malware and phishing threats. In uAssets, contributed to the badware filter list by adding multiple malicious domains, leveraging JSON and plaintext for structured data management and filter updates. In polkadot-js/phishing, updated the phishing domain deny list and maintained the all.json file to block newly identified phishing sites. Emphasized data integrity and traceability through well-documented, co-authored commits. This work improved threat detection and prevention, reduced user exposure to harmful domains, and reinforced secure-by-default practices through diligent filter management and cross-repository collaboration.