Fixing two issues including a crash in KDE environments.
The security fix is not relevant on Linux but included anyway.

This might be the last update for 42.1 but I thought fixing those there
makes sense even w/o a real security incident

- update to Firefox 52.1.1
MFSA 2017-14
* CVE-2017-5031: Use after free in ANGLE (bmo#1328762)
(Windows only, Linux not affected)
- switch to Mozilla's geolocation service (boo#1026989)
- removed mozilla-preferences.patch obsoleted by overriding via
firefox.js
- fixed KDE integration to avoid crash caused by filepicker
(boo#1015998)