"data": {
   "last": {},
   "days": {
     "2014-12-10": {
       "PJiP+86+sb9ES/sA1y9/TiMv3Iw=": {
         "org.mozilla.appSessions": {
           "normal": [
             {
               "r": "P",
               "sg": 4525,
               "d": 7,
               "sj": 987
             },
             {
               "r": "P",
               "d": 0
             }
           ],
           "_v": "4"
         }
       }
     }
   }
 },
 "environments": {
   "PJiP+86+sb9ES/sA1y9/TiMv3Iw=": {
     "org.mozilla.appInfo.appinfo": {
       "isTelemetryEnabled": 0,
       "_v": 3
     }
   },
   "current": {
     "org.mozilla.device.config": {
       "hasHardwareKeyboard": false,
       "screenXInMM": 62,
       "screenLayout": 2,
       "uiType": "default",
       "screenYInMM": 111,
       "_v": 1,
       "uiMode": 1
     },
     "org.mozilla.sysinfo.sysinfo": {
       "memoryMB": 1821,
       "cpuCount": 4,
       "architecture": "armeabi-v7a",
       "_v": 1,
       "version": "4.2.2",
       "name": "Android"
     },
     "org.mozilla.profile.age": {
       "_v": 1,
       "profileCreation": 16414
     },
     "hash": "wghzt05VJhn/Gj96Bz6t24BjPvE=",
     "org.mozilla.addons.active": {
       "_v": 1
     },
     "org.mozilla.appInfo.appinfo": {
       "appLocale": "en_us",
       "distribution": "",
       "isTelemetryEnabled": 1,
       "osLocale": "en_us",
       "isBlocklistEnabled": 1,
       "acceptLangIsUserSet": 0,
       "_v": 3
     },
     "geckoAppInfo": {
       "updateChannel": "release",
       "id": "{aa3c5121-dab2-40e2-81ca-7ea25febc110}",
       "os": "Android",
       "platformBuildID": "20141126155703",
       "platformVersion": "34.0",
       "vendor": "Mozilla",
       "name": "fennec",
       "xpcomabi": "arm-eabi-gcc3",
       "appBuildID": "20141126155703",
       "_v": 1,
       "version": "34.0"
     },
     "org.mozilla.addons.counts": {
       "extension": 0,
       "plugin": 0,
       "_v": 1,
       "theme": 0
     }
   }
 },
 "lastPingDate": "2013-05-02",
 "thisPingDate": "2014-12-10",
 "version": 3

Short details: Mobile Firefox on Android 4.2 (Galaxy S4). "Raw Data" at the very bottom. Related questions: 1022870, 1028446, 1026282. I also found this bug report, but using Nightly didn't work, and upgrading OS isn't an option. In summary, FF for Android crashes 5-10 seconds after visiting any site. It doesn't produce crash logs. Raw Data { "data": { "last": {}, "days": { "2014-12-10": { "PJiP+86+sb9ES/sA1y9/TiMv3Iw=": { "org.mozilla.appSessions": { "normal": [ { "r": "P", "sg": 4525, "d": 7, "sj": 987 }, { "r": "P", "d": 0 } ], "_v": "4" } } } } }, "environments": { "PJiP+86+sb9ES/sA1y9/TiMv3Iw=": { "org.mozilla.appInfo.appinfo": { "isTelemetryEnabled": 0, "_v": 3 } }, "current": { "org.mozilla.device.config": { "hasHardwareKeyboard": false, "screenXInMM": 62, "screenLayout": 2, "uiType": "default", "screenYInMM": 111, "_v": 1, "uiMode": 1 }, "org.mozilla.sysinfo.sysinfo": { "memoryMB": 1821, "cpuCount": 4, "architecture": "armeabi-v7a", "_v": 1, "version": "4.2.2", "name": "Android" }, "org.mozilla.profile.age": { "_v": 1, "profileCreation": 16414 }, "hash": "wghzt05VJhn/Gj96Bz6t24BjPvE=", "org.mozilla.addons.active": { "_v": 1 }, "org.mozilla.appInfo.appinfo": { "appLocale": "en_us", "distribution": "", "isTelemetryEnabled": 1, "osLocale": "en_us", "isBlocklistEnabled": 1, "acceptLangIsUserSet": 0, "_v": 3 }, "geckoAppInfo": { "updateChannel": "release", "id": "{aa3c5121-dab2-40e2-81ca-7ea25febc110}", "os": "Android", "platformBuildID": "20141126155703", "platformVersion": "34.0", "vendor": "Mozilla", "name": "fennec", "xpcomabi": "arm-eabi-gcc3", "appBuildID": "20141126155703", "_v": 1, "version": "34.0" }, "org.mozilla.addons.counts": { "extension": 0, "plugin": 0, "_v": 1, "theme": 0 } } }, "lastPingDate": "2013-05-02", "thisPingDate": "2014-12-10", "version": 3 }