browser extensionsadvancedReddit r/node production incident post-mortem threadMAX
Extension UI Theming Breaking Across Host Page CSS Environments : Main-Thread Budget Discipline in Hostile Host Pages
TypeScriptShadow DOMConstructable StylesheetsPlaywright
Problem Breakdown
The performance defect is running content-level work (capture, analysis, annotation) on the host page's main thread without a budget: the host page's own render loop and the extension's work contend, and the user experiences the contention as jank or freeze in the page they were using : the extension becomes the page's…
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