Update to Firefox 31.7.0esr

- update to Firefox 31.7.0esr (bnc#930622)
* MFSA 2015-46/CVE-2015-2708
Miscellaneous memory safety hazards
* MFSA 2015-47/VE-2015-0797 (bmo#1080995)
Buffer overflow parsing H.264 video with Linux Gstreamer
* MFSA 2015-48/CVE-2015-2710 (bmo#1149542)
Buffer overflow with SVG content and CSS
* MFSA 2015-51/CVE-2015-2713 (bmo#1153478)
Use-after-free during text processing with vertical text enabled
* MFSA 2015-54/CVE-2015-2716 (bmo#1140537)
Buffer overflow when parsing compressed XML
* MFSA 2015-57/CVE-2011-3079 (bmo#1087565)
Privilege escalation through IPC channel messages

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