User Agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/51.0.2704.79 Safari/537.36 Steps to reproduce: I tested on Ubuntu 14.04 64 bit 1. Run firefox ./firefox 2. Run another Firefox I downloaded this Firefox by using funfuzz manager(domfuzz) funfuzz/util/downloadBuild.py --want-tests source: https://github.com/MozillaSecurity/funfuzz/tree/master/dom Actual results: Debug message displays memory leak Expected results: I am not sure what the root cause is... Is this an intended behavior? If I am wrong... I am really sorry.
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Debug message  WARNING: XPCOM objects created/destroyed from static ctor/dtor: file /builds/slave/m-cen-l64-d-000000000000000000/build/src/xpcom/base/nsTraceRefcnt.cpp, line 174 nsStringStats => mAllocCount: 19 => mReallocCount: 11 => mFreeCount: 18 -- LEAKED 1 !!! => mShareCount: 14 => mAdoptCount: 1 => mAdoptFreeCount: 1 => Process ID: 3814, Thread ID: 140493127751552
User Agent: Mozilla/5.0 (X11; Linux x86_64; rv:49.0) Gecko/20100101 Firefox/49.0 I have tested this issue on Ubuntu 16.04 x64, Ubuntu 14.04 x64 and Ubuntu 12.04 x64 with the latest Firefox release (47.0) and the latest Nightly build from the specified source in the description (49.0a1-20160511055410) and managed to reproduce it. After downloading the build, when opening another Firefox the debug message with the memory leak is displayed in the terminal.