Developed and delivered the Mangago Extension for the keiyoushi/extensions-source repository, focusing on stable chapter tracking across rotating domains. The work addressed the challenge of maintaining data integrity during domain changes by implementing robust URL parsing and preserving chapter paths to prevent read state loss. Applied cross-domain rate limiting to both main and reader domains, ensuring reliable performance under high-load conditions and compliance with domain policies. Utilized Kotlin and RxJava within the Android development environment, leveraging Gradle for build management. The feature enhanced user experience by improving reliability and state preservation, demonstrating careful attention to code quality and version control discipline.