Worked on stability and standards compliance for the LadybirdBrowser/ladybird and nikitabobko/ladybird repositories, focusing on MIME type detection and handling. Addressed two critical bugs by updating the RAR archive signature in the MimeSniff library to match the latest specification, improving the accuracy of RAR file identification and reducing misclassification during uploads. Additionally, corrected a font MIME type typo to ensure spec-compliant detection of OTF fonts, enhancing reliability across the rendering pipeline. Employed C++ for library development and rigorous testing, with a methodical approach centered on traceable, spec-aligned commits that improved downstream processing and platform-wide content-type handling.