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Extension Content Script Injection Failing on SPA Route Changes : Cross-Context Consistency for Ephemeral UIs

TypeScriptContent ScriptsMutationObserverZod

Problem Breakdown

The consistency defect is that UI surfaces (popups, panels, widgets) mount and unmount against a background state that keeps changing, and the UI's snapshot-and-act model has no protocol for staying consistent with that moving state. Content scripts inject at document_idle by default; SPAs that render content client-si…

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