STR: 1. Download http://clb.demon.fi/bugs/large_xhr_allocation_size_overflow/UnrealEngine4_Development_SafeHeap.7z 2. Uncompress (it is LZMA2), and run python -m SimpleHTTPServer in the directory, and open http://localhost:8000/MyProject.html in browser. (64-bit browser is preferred) Observed: Accessing the result of the XHR throws an exception "allocation size overflow" inside jQuery, when it is reading the xhr.responseText property. Happens on both FF Stable 49 and current Nightly. Expected: The test system has 32GB of RAM, it should easily be able to handle a 300MB JS file in a 64-bit browser. (not expecting this to not OOM on a 32-bit browser though)
"allocation size overflow" is a JS engine message, so tentatively -> JS Engine. That file is probably in utf8, and the data will be converted to utf16, so 2x memory, but should still be fine.
Priority: -- → P3
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