- Update mozilla-gtk3_20.patch to latest version from Fedora.

- update to Firefox 48.0 (boo#991809)
* requires NSS 3.24
* Process separation (e10s) is enabled for some of you
* Add-ons that have not been verified and signed by Mozilla will not load
* WebRTC embetterments
* The media parser has been redeveloped using the Rust programming
language
* better Canvas performance with speedy Skia support
security fixes:
* MFSA 2016-62/CVE-2016-2835/CVE-2016-2836
Miscellaneous memory safety hazards
* MFSA 2016-63/CVE-2016-2830 (bmo#1255270)
Favicon network connection can persist when page is closed
* MFSA 2016-64/CVE-2016-2838 (bmo#1279814)
Buffer overflow rendering SVG with bidirectional content
* MFSA 2016-65/CVE-2016-2839 (bmo#1275339)
Cairo rendering crash due to memory allocation issue with FFmpeg 0.10
* MFSA 2016-66/CVE-2016-5251 (bmo#1255570)
Location bar spoofing via data URLs with malformed/invalid mediatypes
* MFSA 2016-67/CVE-2016-5252 (bmo#1268854)
Stack underflow during 2D graphics rendering
* MFSA 2016-68/CVE-2016-0718 (bmo#1236923)
Out-of-bounds read during XML parsing in Expat library
* MFSA 2016-69/CVE-2016-5253 (bmo#1246944)
Arbitrary file manipulation by local user through Mozilla updater
and callback application path parameter (Windows-only)
* MFSA 2016-70/CVE-2016-5254 (bmo#1266963)
Use-after-free when using alt key and toplevel menus