Related issue:
- https://github.com/uBlockOrigin/uBlock-issues/issues/214
Built-in whitelist directives are now rendered differently
than user-defined whitelist directives. Also, removing a
built-in whitelist directive will only cause that directive
to be commented out, so that users do not have to remember
built-in directives should they want to bring them back.
Related issue:
https://github.com/uBlockOrigin/uBlock-issues/issues/494
The built-in per-site switch rule
`no-scripting: behind-the-scene false` has been removed,
it should not ever be needed since there will always be a
valid root context for main- and sub-frames.
Relocate workaround to the code responsible to compute filtering context, such
that the workaround will also be applied in other code paths, for example also
for webRequest.onHeadersReceived.
