See https://www.mozilla.org/en-US/firefox/63.0.1/releasenotes/
- fix build with cbindgen 0.6.7
- really disable media autoplay by default, the knob changed (cf #1470082)
- use about:blank as default homepage/new tab page in new profiles.
Rationale: some parts of Activity Stream (the new Firefox Home) are nice
(ie searchbox, highlights, topsites from browsing history, etc) but
'snippets' is invasive (them being broken is a driver for this version,
cf #1503047, where comments are.. worrying), as is 'Recommended by
pocket' content shown to some countries (DE, CA, US..) - sadly, those
two sections cant easily be disabled (cf #1504279) on about:newtab, so
use the about:blank big hammer for privacy. Existing profiles still
using the default 'Firefox Home' are advised to visit
about:preferences#home and uncheck 'snippets' and 'pages saved to
pocket'... and read https://www.mozilla.org/en-US/privacy/firefox/.
While here add a section in pkg/README advising users using NIS or with
profiles on NFS to add getpw to the content process pledge, as it's
apparently needed in those conditions.
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