Re: [w3c/manifest] Privacy Review: handle start_url tracking (#399)

I think the question of fingerprints is a serious problem.
The only solution I can think of would be a central registry, which would only allow one url per domain and language.

```json
"start_url": "https://pwa-registry.org?url=example.com/app.webmanifest&lang=en"
```
The url https://pwa-registry.org?url=example.com/en.webmanifest&lang=en 
then would redirect to example.com/en.webmanifest or deliver its contents.

Someone like mozilla would have to maintain the registry.

I would even assume this as "installability signals".




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