Update to 53.0

Changelog:
New
    Improved graphics stability for Windows users with the addition of compositor process separation (Quantum Compositor)
    Two new 'compact' themes available in Firefox, dark and light, based on the Firefox Developer Edition theme
    Lightweight themes are now applied in private browsing windows
    Reader Mode now displays estimated reading time for the page
    Windows 7+ users on 64-bit OS can select 32-bit or 64-bit versions in the stub installer

Fixed
    Various security fixes

Changed
    Updated the design of site permission requests to make them harder to miss and easier to understand
    Windows XP and Vista are no longer supported. XP and Vista users running Firefox 52 will continue to receive security updates on Firefox ESR 52.
    32-bit Mac OS X is no longer supported. 32-bit Mac OS X users can switch to Firefox ESR 52 to continue receiving security updates.
    Updates for Mac OS X are smaller in size compared to updates for Firefox 52
    New visual design for audio and video controls
    Ended Firefox Linux support for processors older than Pentium 4 and AMD Opteron
    The last few characters of shortened tab titles fade out instead of being replaced by ellipses to keep more of the title visible

Security fixes:
 #CVE-2017-5433: Use-after-free in SMIL animation functions
 #CVE-2017-5435: Use-after-free during transaction processing in the editor
 #CVE-2017-5436: Out-of-bounds write with malicious font in Graphite 2
 #CVE-2017-5461: Out-of-bounds write in Base64 encoding in NSS
 #CVE-2017-5459: Buffer overflow in WebGL
 #CVE-2017-5466: Origin confusion when reloading isolated data:text/html URL
 #CVE-2017-5434: Use-after-free during focus handling
 #CVE-2017-5432: Use-after-free in text input selection
 #CVE-2017-5460: Use-after-free in frame selection
 #CVE-2017-5438: Use-after-free in nsAutoPtr during XSLT processing
 #CVE-2017-5439: Use-after-free in nsTArray Length() during XSLT processing
 #CVE-2017-5440: Use-after-free in txExecutionState destructor during XSLT processing
 #CVE-2017-5441: Use-after-free with selection during scroll events
 #CVE-2017-5442: Use-after-free during style changes
 #CVE-2017-5464: Memory corruption with accessibility and DOM manipulation
 #CVE-2017-5443: Out-of-bounds write during BinHex decoding
 #CVE-2017-5444: Buffer overflow while parsing application/http-index-format content
 #CVE-2017-5446: Out-of-bounds read when HTTP/2 DATA frames are sent with incorrect data
 #CVE-2017-5447: Out-of-bounds read during glyph processing
 #CVE-2017-5465: Out-of-bounds read in ConvolvePixel
 #CVE-2017-5448: Out-of-bounds write in ClearKeyDecryptor
 #CVE-2017-5437: Vulnerabilities in Libevent library
 #CVE-2017-5454: Sandbox escape allowing file system read access through file picker
 #CVE-2017-5455: Sandbox escape through internal feed reader APIs
 #CVE-2017-5456: Sandbox escape allowing local file system access
 #CVE-2017-5469: Potential Buffer overflow in flex-generated code
 #CVE-2017-5445: Uninitialized values used while parsing application/http-index-format content
 #CVE-2017-5449: Crash during bidirectional unicode manipulation with animation
 #CVE-2017-5450: Addressbar spoofing using javascript: URI on Firefox for Android
 #CVE-2017-5451: Addressbar spoofing with onblur event
 #CVE-2017-5462: DRBG flaw in NSS
 #CVE-2017-5463: Addressbar spoofing through reader view on Firefox for Android
 #CVE-2017-5467: Memory corruption when drawing Skia content
 #CVE-2017-5452: Addressbar spoofing during scrolling with editable content on Firefox for Android
 #CVE-2017-5453: HTML injection into RSS Reader feed preview page through TITLE element
 #CVE-2017-5458: Drag and drop of javascript: URLs can allow for self-XSS
 #CVE-2017-5468: Incorrect ownership model for Private Browsing information
 #CVE-2017-5430: Memory safety bugs fixed in Firefox 53 and Firefox ESR 52.1
 #CVE-2017-5429: Memory safety bugs fixed in Firefox 53, Firefox ESR 45.9, and Firefox ESR 52.1

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