-e: see title, scene from unity standard assets

-repro:
--1) get Standard Assets from A$ https://www.assetstore.unity3d.com/en/#!/content/32351
--2) build the included particle scene for WebGL
--3) run that scene
--NOTICE it either crashes right away or once you click into the scene to make "explosions"

-tested:
-crashed right away in FF
-crashed on clicking in Chrome
-crashed on clicking in Safari
-crashed after a few clicks in Edge

-works fine with 5.3.2

-chrome error:
warning: a problem occurred in builtin C++ name demangling; build with -s DEMANGLE_SUPPORT=1 to link in libcxxabi demanglingModule.printErr @ UnityLoader.js:3391
UnityLoader.js:3329 Invoking error handler due to
Uncaught abort() at Error
at jsStackTrace (blob:file%3A///1913bb0e-43c6-489a-9378-79d432fb9269:1064:12)
at stackTrace (blob:file%3A///1913bb0e-43c6-489a-9378-79d432fb9269:1078:21)
at Object.abort (blob:file%3A///1913bb0e-43c6-489a-9378-79d432fb9269:1859747:43)
at _abort (blob:file%3A///1913bb0e-43c6-489a-9378-79d432fb9269:8497:17)
at _try_realloc_chunk (blob:file%3A///1913bb0e-43c6-489a-9378-79d432fb9269:651383:17)
at _realloc (blob:file%3A///1913bb0e-43c6-489a-9378-79d432fb9269:1611645:7)
at __ZN13MemoryManager18LowLevelReallocateEPvjj [MemoryManager::LowLevelReallocate(void*, unsigned int, unsigned int)] (blob:file%3A///1913bb0e-43c6-489a-9378-79d432fb9269:1822953:9)
at __ZN17LowLevelAllocator7ReallocEPvjj [LowLevelAllocator::Realloc(void*, unsigned int, unsigned int)] (blob:file%3A///1913bb0e-43c6-489a-9378-79d432fb9269:1805595:9)
at Array.__ZN21UnityDefaultAllocatorI17LowLevelAllocatorE10ReallocateEPvji [Reallocate? UnityDefaultAllocator<LowLevelAllocator?>(void*, unsigned int, int)] (blob:file%3A///1913bb0e-43c6-489a-9378-79d432fb9269:1099968:7)
at __ZN13MemoryManager10ReallocateEPvjiRK10MemLabelIdiPKci [MemoryManager::Reallocate(void*, unsigned int, int, int&, char*, int)] (blob:file%3A///1913bb0e-43c6-489a-9378-79d432fb9269:793292:75)
blob:file%3A///1913bb0e-43c6-489a-9378-79d432fb9269:10580 Uncaught abort() at Error
at jsStackTrace (blob:file%3A///1913bb0e-43c6-489a-9378-79d432fb9269:1064:12)
at stackTrace (blob:file%3A///1913bb0e-43c6-489a-9378-79d432fb9269:1078:21)
at Object.abort (blob:file%3A///1913bb0e-43c6-489a-9378-79d432fb9269:1859747:43)
at _abort (blob:file%3A///1913bb0e-43c6-489a-9378-79d432fb9269:8497:17)
at _try_realloc_chunk (blob:file%3A///1913bb0e-43c6-489a-9378-79d432fb9269:651383:17)
at _realloc (blob:file%3A///1913bb0e-43c6-489a-9378-79d432fb9269:1611645:7)
at __ZN13MemoryManager18LowLevelReallocateEPvjj [MemoryManager::LowLevelReallocate(void*, unsigned int, unsigned int)] (blob:file%3A///1913bb0e-43c6-489a-9378-79d432fb9269:1822953:9)
at __ZN17LowLevelAllocator7ReallocEPvjj [LowLevelAllocator::Realloc(void*, unsigned int, unsigned int)] (blob:file%3A///1913bb0e-43c6-489a-9378-79d432fb9269:1805595:9)
at Array.__ZN21UnityDefaultAllocatorI17LowLevelAllocatorE10ReallocateEPvji [Reallocate? UnityDefaultAllocator<LowLevelAllocator?>(void*, unsigned int, int)] (blob:file%3A///1913bb0e-43c6-489a-9378-79d432fb9269:1099968:7)
at __ZN13MemoryManager10ReallocateEPvjiRK10MemLabelIdiPKci [MemoryManager::Reallocate(void*, unsigned int, int, int&, char*, int)] (blob:file%3A///1913bb0e-43c6-489a-9378-79d432fb9269:793292:75)

-FIREFOX error
warning: a problem occurred in builtin C++ name demangling; build with -s DEMANGLE_SUPPORT=1 to link in libcxxabi demangling UnityLoader.js:146:2

Invoking error handler due to
uncaught exception: abort() at jsStackTrace@blob:null/6651ea0a-baf8-5442-a72c-f17130251e44:1064:12
stackTrace@blob:null/6651ea0a-baf8-5442-a72c-f17130251e44:1078:21
abort@blob:null/6651ea0a-baf8-5442-a72c-f17130251e44:1858848:43
_abort@blob:null/6651ea0a-baf8-5442-a72c-f17130251e44:8501:2
_try_realloc_chunk@blob:null/6651ea0a-baf8-5442-a72c-f17130251e44:651002:29
_realloc@blob:null/6651ea0a-baf8-5442-a72c-f17130251e44:1610638:7
__ZN13MemoryManager18LowLevelReallocateEPvjj [MemoryManager::LowLevelReallocate(void*, unsigned int, unsigned int)]@blob:null/6651ea0a-baf8-5442-a72c-f17130251e44:1822132:9
__ZN17LowLevelAllocator7ReallocEPvjj [LowLevelAllocator::Realloc(void*, unsigned int, unsigned int)]@blob:null/6651ea0a-baf8-5442-a72c-f17130251e44:1804764:9
__ZN21UnityDefaultAllocatorI17LowLevelAllocatorE10ReallocateEPvji [Reallocate? UnityDefaultAllocator<LowLevelAllocator?>(void*, unsigned int, int)]@blob:null/6651ea0a-baf8-5442-a72c-f17130251e44:1103209:7
__ZN13MemoryManager10ReallocateEPvjiRK10MemLabelIdiPKci [MemoryManager::Reallocate(void*, unsigned int, int, int&, char*, int)]@blob:null/6651ea0a-baf8-5442-a72c-f17130251e44:795409:7
__Z16realloc_internalPvjiRK10MemLabelIdiPKci [realloc_internal(void*, unsigned int, int, int&, char*, int)]@blob:null/6651ea0a-baf8-5442-a72c-f17130251e44:1749784:9
__ZN23ParticleSystemParticles12array_resizeEj [ParticleSystemParticles::array_resize(unsigned int)]@blob:null/6651ea0a-baf8-5442-a72c-f17130251e44:226455:21
__ZN14ParticleSystem18Update1IncrementalERS_RK27ParticleSystemReadOnlyStateR19ParticleSystemStateR23ParticleSystemParticlesfb [ParticleSystem::Update1Incremental?_(undefined?S?&)]@blob:null/6651ea0a-baf8-5442-a72c-f17130251e44:648896:5
__ZN14ParticleSystem7Update1ERS_R23ParticleSystemParticlesfbbi [ParticleSystem::Update1?_(undefined?S?&)]@blob:null/6651ea0a-baf8-5442-a72c-f17130251e44:724016:3
__ZN14ParticleSystem14BeginUpdateAllEv [ParticleSystem::BeginUpdateAll()]@blob:null/6651ea0a-baf8-5442-a72c-f17130251e44:1271254:4
__ZZN14ParticleSystem15InitializeClassEvEN47PreLateUpdateParticleSystemBeginUpdateAllstruct7ForwardEv [undefined?Z()]@blob:null/6651ea0a-baf8-5442-a72c-f17130251e44:1807314:2
__Z10PlayerLoopbbP10IHookEvent [PlayerLoop(bool, bool, IHookEvent?*)]@blob:null/6651ea0a-baf8-5442-a72c-f17130251e44:262180:26
__ZL8MainLoopv [MainLoop()]@blob:null/6651ea0a-baf8-5442-a72c-f17130251e44:1348300:3
dynCall_v@blob:null/6651ea0a-baf8-5442-a72c-f17130251e44:1853592:2
Runtime.dynCall@blob:null/6651ea0a-baf8-5442-a72c-f17130251e44:284:11
Browser_mainLoop_runner/<@blob:null/6651ea0a-baf8-5442-a72c-f17130251e44:9210:5
Browser.mainLoop.runIter@blob:null/6651ea0a-baf8-5442-a72c-f17130251e44:10578:5
Browser_mainLoop_runner@blob:null/6651ea0a-baf8-5442-a72c-f17130251e44:9206:3
UnityLoader.js:84:9
uncaught exception: abort() at jsStackTrace@blob:null/6651ea0a-baf8-5442-a72c-f17130251e44:1064:12
stackTrace@blob:null/6651ea0a-baf8-5442-a72c-f17130251e44:1078:21
abort@blob:null/6651ea0a-baf8-5442-a72c-f17130251e44:1858848:43
_abort@blob:null/6651ea0a-baf8-5442-a72c-f17130251e44:8501:2
_try_realloc_chunk@blob:null/6651ea0a-baf8-5442-a72c-f17130251e44:651002:29
_realloc@blob:null/6651ea0a-baf8-5442-a72c-f17130251e44:1610638:7
__ZN13MemoryManager18LowLevelReallocateEPvjj [MemoryManager::LowLevelReallocate(void*, unsigned int, unsigned int)]@blob:null/6651ea0a-baf8-5442-a72c-f17130251e44:1822132:9
__ZN17LowLevelAllocator7ReallocEPvjj [LowLevelAllocator::Realloc(void*, unsigned int, unsigned int)]@blob:null/6651ea0a-baf8-5442-a72c-f17130251e44:1804764:9
__ZN21UnityDefaultAllocatorI17LowLevelAllocatorE10ReallocateEPvji [Reallocate? UnityDefaultAllocator<LowLevelAllocator?>(void*, unsigned int, int)]@blob:null/6651ea0a-baf8-5442-a72c-f17130251e44:1103209:7
__ZN13MemoryManager10ReallocateEPvjiRK10MemLabelIdiPKci [MemoryManager::Reallocate(void*, unsigned int, int, int&, char*, int)]@blob:null/6651ea0a-baf8-5442-a72c-f17130251e44:795409:7
__Z16realloc_internalPvjiRK10MemLabelIdiPKci [realloc_internal(void*, unsigned int, int, int&, char*, int)]@blob:null/6651ea0a-baf8-5442-a72c-f17130251e44:1749784:9
__ZN23ParticleSystemParticles12array_resizeEj [ParticleSystemParticles::array_resize(unsigned int)]@blob:null/6651ea0a-baf8-5442-a72c-f17130251e44:226455:21
__ZN14ParticleSystem18Update1IncrementalERS_RK27ParticleSystemReadOnlyStateR19ParticleSystemStateR23ParticleSystemParticlesfb [ParticleSystem::Update1Incremental?_(undefined?S?&)]@blob:null/6651ea0a-baf8-5442-a72c-f17130251e44:648896:5
__ZN14ParticleSystem7Update1ERS_R23ParticleSystemParticlesfbbi [ParticleSystem::Update1?_(undefined?S?&)]@blob:null/6651ea0a-baf8-5442-a72c-f17130251e44:724016:3
__ZN14ParticleSystem14BeginUpdateAllEv [ParticleSystem::BeginUpdateAll()]@blob:null/6651ea0a-baf8-5442-a72c-f17130251e44:1271254:4
__ZZN14ParticleSystem15InitializeClassEvEN47PreLateUpdateParticleSystemBeginUpdateAllstruct7ForwardEv [undefined?Z()]@blob:null/6651ea0a-baf8-5442-a72c-f17130251e44:1807314:2
__Z10PlayerLoopbbP10IHookEvent [PlayerLoop(bool, bool, IHookEvent?*)]@blob:null/6651ea0a-baf8-5442-a72c-f17130251e44:262180:26
__ZL8MainLoopv [MainLoop()]@blob:null/6651ea0a-baf8-5442-a72c-f17130251e44:1348300:3
dynCall_v@blob:null/6651ea0a-baf8-5442-a72c-f17130251e44:1853592:2
Runtime.dynCall@blob:null/6651ea0a-baf8-5442-a72c-f17130251e44:284:11
Browser_mainLoop_runner/<@blob:null/6651ea0a-baf8-5442-a72c-f17130251e44:9210:5
Browser.mainLoop.runIter@blob:null/6651ea0a-baf8-5442-a72c-f17130251e44:10578:5
Browser_mainLoop_runner@blob:null/6651ea0a-baf8-5442-a72c-f17130251e44:9206:3