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EXT_COMPAT_UNSUPPORTED

EXT_COMPAT_UNSUPPORTED — Code uses a chrome.* API that is not supported on one of your declared target browsers.

When you see this

Section titled “When you see this”

You called something like chrome.tabGroups.update(…) while targeting Safari.

How to fix

Section titled “How to fix”

Either gate the call behind a runtime check, drop the unsupported browser from browsers, or suppress per-line with // extforge-ignore-compat: <reason>.