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Comment on Firefox 87 introduces SmartBlock for Private Browsingparent

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Hi, lead SmartBlock dev here. My regular job at Mozilla involves diagnosing web sites for web compatibility issues, so I definitely share your concerns -- I routinely see sites relying on scripts loading in a specific order, but not coding themselves in a way that ensures that they actually do.

I haven't received any reports so far during the six-month-or-so nightly cycle where SmartBlock was only on nightly builds, so I'm optimistic. In the worst case we might be able to just add in an artificial delay to fix that, but of course I'd rather waste user's time like that unless that's 100% necessary.

And ultimately, problems are at least as likely (in my experience) to manifest with scripts loading too slowly, or not loading at all due to random networking hiccups.. many sites just aren't very tolerant at all of script loading failures.

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