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When using the Glean Chrome extension as the default new tab experience, the page initially renders but is completely non-interactive (clicks do not register, UI appears frozen). After approximately 30–40 seconds, the page becomes responsive and functions normally.

I’ve already tried reinstalling the extension, restarting Chrome and my computer, and updating Chrome to the latest version.

Page appears “frozen” and cannot be interacted with

No obvious blocking errors in the console during the delay

After ~40 seconds, additional network activity occurs and the page becomes fully interactive

No consistent blocking errors at time of freeze

Cannot read properties of null (reading 'postMessage')

Repeated warnings about preloaded resources (e.g. 

Network tab shows delayed JavaScript/activity around the time the page becomes interactive


 This appears to be related to delayed initialization (possibly auth/session bootstrap, iframe/message initialization, or a dependency timing out and retrying), rather than a full page crash.

Are there known issues with the Glean new tab experience related to delayed interactivity or initialization timing?

Are there specific network requests, services, or extension components that could cause a ~30–40 second delay before the page becomes interactive?

Any recommended debugging steps or logs I should capture to help isolate the root cause?

Glean Chrome New Tab Page Loads but Remains Non-Interactive for ~40 Seconds Before Becoming Usable

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