Related issue:
- https://github.com/uBlockOrigin/uBlock-issues/issues/548
The fix applies only to Chromium-based browsers -- a
`X-DNS-Prefetch-Control` header[1] will be unconditionally
injected when uBO's "Disable pre-fetching" setting is
enabled (it is by default).
This is a mitigation, this does not completely fix the issue
of the setting "Disable pre-fetching" being disregarded on
Chromium-based browsers when sites use
`preconnect`/`preload`.
[1] https://developer.mozilla.org/docs/Web/HTTP/Headers/X-DNS-Prefetch-Control
Related issue:
- https://github.com/uBlockOrigin/uBlock-issues/issues/407
Both flavors will be stitched together into a single
`vapi-qebrequest.js` file.
The decision of which flavor to use will be made at runtime,
according to the browser environment.
