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Firefox's navigator.mediaCapabilities.decodingInfo costs ~14 ms per call (out-of-process RDD decoder probe). Shaka Player calls it once per Variant in the DASH manifest while filtering supported variants, and YouTube manifests routinely have 1000+ variants, so player initialization stalls 15-20 s on Gecko-based browsers before the first SourceBuffer is added. Wrap decodingInfo to delegate "supported" checks to MediaSource.isTypeSupported (sub-ms on Firefox) with a per-MIME cache. DRM probes and non-media-source queries fall through to native. Wrapper is gated to Gecko UAs so Chromium and Safari are unaffected. Refs: https://github.com/shaka-project/shaka-player/issues/4775 Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>