update-media-lib

Updating vendored media libraries in Firefox involves identifying the library, consulting its moz.yaml configuration, running mach vendor, applying patches when required, and testing the build. This skill automates that workflow for libvpx, libdav1d, libaom, libopus, libwebp, libjxl, and other media components, handling library-specific vendor methods and patch application.

Firefox media libraries support three vendor update strategies: two-step updates with patches for complex libraries, simple vendor updates for straightforward upgrades, and script-based updates for specialized components. The moz.yaml configuration guides which strategy applies to each library.

Patch application depends on the library's vendor method defined in moz.yaml. Some libraries require manual or automated patch application after vendoring; others use simple vendor workflows without patches. This skill follows per-library guidance and applies patches when needed.

After updating vendored Rust crates, you can optionally run cargo vet audits to validate dependencies. This skill supports the cargo vet audit step as part of its standardized workflow for Rust media components.

After vendoring, the workflow includes building and testing the Firefox source tree to ensure the updated library integrates correctly. For Rust crates, optional cargo vet audits validate the dependencies before final integration.