2699: device sensor API

user.js

@@ -1457,6 +1457,8 @@ user_pref("privacy.firstparty.isolate.restrict_opener_access", true);
  ** spoof Navigator API (see section 2697) (FF56+)
    The version number will be rounded to the "nearest" multiple of 10
    [1] https://bugzilla.mozilla.org/show_bug.cgi?id=1333651
+ ** disable device sensor API (see 2512) (FF56+)
+   [1] https://bugzilla.mozilla.org/show_bug.cgi?id=1369319
 ***/
 /* 2699a: enable privacy.resistFingerprinting (FF41+)
  * [1] https://bugzilla.mozilla.org/show_bug.cgi?id=418986 ***/