Hey folks
We’re getting an isolated report (not something happening often, probably an old phone) of our checkout UI extension (API 2025.7, network_access = true) crashing with TypeError: signal.throwIfAborted is not a function, specifically in the in-app Facebook browser on Android (not sure which version). We pass an AbortSignal to fetch but never call throwIfAborted ourselves, and the string isn’t anywhere in our bundle, so it looks like the sandbox’s mediated fetch is calling signal.throwIfAborted() without feature-detecting - and that method only landed around 2022. Could this be guarded or polyfilled in the sandbox runtime?
Also, what’s the official minimum supported browser baseline for checkout UI extensions?