cross-browser-compatibility

CRITICAL E005: Suspicious download URL detected in skill instructions.

• Suspicious download URL detected (high risk: 0.70). The GitHub link points to a nonstandard/unknown username repository (AntSim/anthropic-ai-webextension-polyfill) instead of the widely used official webextension-polyfill, which could be a typosquat or untrusted fork that may distribute malicious code.