RamonUnch

The latest version that works on Windows XP is [cronbuild-2.3.18510](https://github.com/DynamoRIO/drmemory/releases/tag/cronbuild-2.3.18510) The next release used newer `dbghelp.dll` that no longer woks on Windows XP. DrMemory Itself would still work on XP...

I will try to reproduce, do you have the problem only for Firefox? Or does it happen for other windows as well.