Pale Moon 27.5.1

Changes/fixes:
Changed the default Windows 10 styling when no accent color is aplied to black-on-white.
Changed the theme styling on Windows 10 when the system window frame is used (menu bar enabled) to use the window manager background directly, preventing visual lag updating the window color when it changes.
Updated user agent overrides for DropBox, YouTube and Yahoo to work around user agent sniffing issues.
Fixed a crash in the media subsystem.
Fixed a regression where video playback hardware acceleration was disabled incorrectly on some systems.
Security fixes:
Updated libhyphen to the latest upstream code to fix a security issue.
Updated NSPR to 4.16-RTM with a patch to un-bust building on win64.
Updated NSS to 3.32.1-RTM.
Worked around some more issues with Mac fonts (CVE-2017-7825).
Fixed a potential rooting hazard in NPAPI plugin code.
Fixed a potential reference issue in JavaScript arrays.