Many network requests wrongly categorized as behind-the-scene

[gorhill]

This was first reported for uMatrix: gorhill/uMatrix#165.

Test case as reported in original bug: https://boards.4chan.org/g/. Many css resources are being reported in the behind-the-scene context (the unified logger made the issue obvious, whereas it would go unnoticed before unless specifically observing behind-the-scene requests).

uBlock suffers the same issue. This was fixed in uMatrix by no longer relying on shouldLoad, since uMatrix does not consider embedded frames as specific context.

The fix for uBlock will have to be different.

The problem with requests being wrongly categorized as behind-the-scene is that some requests which may have been blocked in the proper context won't be blocked if evaluated in the behind-the-scene context.