Log Message:
Update to 69.0

* Use clang to compile all files. Mix of gcc and clang causes some errors in
  Rust c++ command invocation (C++ header mismatches).

Changelog:
New

    Enhanced Tracking Protection (ETP) rolls out stronger privacy protections:
        The default standard setting for this feature now blocks third-party \ 
tracking cookies and cryptominers.
        The optional strict setting blocks fingerprinters as well as the items \ 
blocked in the standard setting.

    The Block Autoplay feature is enhanced to give users the option to block any \ 
video that automatically starts playing, not just those that automatically play \ 
with sound.

    For our users in the US or using the en-US browser, we are shipping a new \ 
“New Tab” page experience that connects you to the best of Pocket’s \ 
content.

    Support for the Web Authentication HmacSecret extension via Windows Hello \ 
now comes with this release, for versions of Windows 10 May 2019 or newer, \ 
enabling more passwordless experiences on the web.

    Support for receiving multiple video codecs with this release makes it \ 
easier for WebRTC conferencing services to mix video from different clients.

    For our users on Windows 10, you’ll see performance and UI improvements:
        Firefox will give Windows hints to appropriately set content process \ 
priority levels, meaning more processor time spent on the tasks you're actively \ 
working on, and less processor time spent on things in the background (with the \ 
exception of video and audio playback).
        For our existing Windows 10 users, you can easily find and launch \ 
Firefox from a shortcut on the Win10 taskbar.

    For our users on macOS, battery life and download UI are both improved:
        macOS users on dual-graphics-card machines (like MacBook Pro) will \ 
switch back to the low-power GPU more aggressively, saving battery life.
        Finder on macOS now displays download progress for files being downloaded.

    JIT support comes to ARM64 for improved performance of our JavaScript \ 
Optimizing JIT compiler.

Fixed

    Various security fixes

Changed

    As previously announced in the Plugin Roadmap for Firefox, the "Always \ 
Activate" option for Flash plugin content has been removed. Firefox will \ 
now always ask for user permission before activating Flash content on a website.

    With the deprecation of Adobe Flash Player, there is no longer a need to \ 
identify users on 32-bit version of the Firefox browser on 64-bit version \ 
operating systems reducing user agent fingerprinting factors providing greater \ 
level of privacy to our users as well as improving the experience of downloading \ 
other apps.

    Firefox no longer loads userChrome.css or userContent.css by default \ 
improving start-up performance. Users who wish to customize Firefox by using \ 
these files can set the toolkit.legacyUserProfileCustomizations.stylesheets \ 
preference to true to restore this ability.

Enterprise

    For Enterprise system administrators that manage macOS computers, we begin \ 
shipping a Mozilla signed PKG installer to simplify your deployments.

Developer

    For our mobile web developers, we have migrated remote debugging from the \ 
old WebIDE into a re-designed about:debugging, making debugging GeckoView on \ 
remote devices via USB rock solid.

    The network panel will now show blocked resources to allow developers to \ 
best understand the impact of content blocking and ad blocking extensions given \ 
our ongoing expansion of Enhanced Tracking Protection to all users with this \ 
release.

    The new event listener breakpoint feature allows developers to pause on a \ 
host of different event types, whether it be related to animations, DOM, media, \ 
mouse, touch, worker, and many other event types.

    Firefox Developer Tools now offers an audit for the presence of text \ 
alternatives for non-text content, the a11y panel checks toolbar has been \ 
augmented to better help developers adhere to WCAG Guideline 1.1.

Security fixes:
#CVE-2019-11751: Malicious code execution through command line parameters
#CVE-2019-11746: Use-after-free while manipulating video
#CVE-2019-11744: XSS by breaking out of title and textarea elements using innerHTML
#CVE-2019-11742: Same-origin policy violation with SVG filters and canvas to \ 
steal cross-origin images
#CVE-2019-11736: File manipulation and privilege escalation in Mozilla \ 
Maintenance Service
#CVE-2019-11753: Privilege escalation with Mozilla Maintenance Service in custom \ 
Firefox installation location
#CVE-2019-11752: Use-after-free while extracting a key value in IndexedDB
#CVE-2019-9812: Sandbox escape through Firefox Sync
#CVE-2019-11741: Isolate addons.mozilla.org and accounts.firefox.com
#CVE-2019-11743: Cross-origin access to unload event attributes
#CVE-2019-11749: Camera information available without prompting using getUserMedia
#CVE-2019-5849: Out-of-bounds read in Skia
#CVE-2019-11750: Type confusion in Spidermonkey
#CVE-2019-11737: Content security policy directives ignore port and path if host \ 
is a wildcard
#CVE-2019-11738: Content security policy bypass through hash-based sources in \ 
directives
#CVE-2019-11747: 'Forget about this site' removes sites from pre-loaded HSTS list
#CVE-2019-11734: Memory safety bugs fixed in Firefox 69
#CVE-2019-11735: Memory safety bugs fixed in Firefox 69 and Firefox ESR 68.1
#CVE-2019-11740: Memory safety bugs fixed in Firefox 69, Firefox ESR 68.1, and \ 
Firefox ESR 60.9