This update to Mozilla Firefox 46.0 fixes several security issues and bugs (boo#977333).

The following vulnerabilities were fixed:

- CVE-2016-2804: Miscellaneous memory safety hazards - MFSA 2016-39
(boo#977373)
- CVE-2016-2806: Miscellaneous memory safety hazards - MFSA 2016-39
(boo#977375)
- CVE-2016-2807: Miscellaneous memory safety hazards - MFSA 2016-39
(boo#977376)
- CVE-2016-2808: Write to invalid HashMap entry through JavaScript.watch()
- MFSA 2016-47 (boo#977386)
- CVE-2016-2811: Use-after-free in Service Worker - MFSA 2016-42
(boo#977379)
- CVE-2016-2812: Buffer overflow in Service Worker - MFSA 2016-42
(boo#977379)
- CVE-2016-2814: Buffer overflow in libstagefright with CENC offsets -
MFSA 2016-44 (boo#977381)
- CVE-2016-2816: CSP not applied to pages sent with
multipart/x-mixed-replace - MFSA 2016-45 (boo#977382)
- CVE-2016-2817: Elevation of privilege with chrome.tabs.update API in web
extensions - MFSA 2016-46 (boo#977384)
- CVE-2016-2820: Firefox Health Reports could accept events from untrusted
domains - MFSA 2016-48 (boo#977388)

The following miscellaneous changes are included:

- Improved security of the JavaScript Just In Time (JIT) Compiler
- WebRTC fixes to improve performance and stability
- Added support for document.elementsFromPoint
- Added HKDF support for Web Crypto API

The minimum requirements increased to NSPR 4.12 and NSS 3.22.3.

Mozilla NSS was updated to 3.22.3 as a dependency for Mozilla Firefox 46.0, with the following changes:

- Increase compatibility of TLS extended master secret, don't send an
empty TLS extension last in the handshake (bmo#1243641)
- RSA-PSS signatures are now supported
- Pseudorandom functions based on hashes other than SHA-1 are now supported
- Enforce an External Policy on NSS from a config file