chore: added ff cheat sheet
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browser_patches/firefox/cheatsheet.md
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browser_patches/firefox/cheatsheet.md
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### Debugging
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#### Stack trace
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It `mozglue/misc/StackWalk.cpp` add
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```c++
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#define MOZ_DEMANGLE_SYMBOLS 1
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```
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In native code use
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```c++
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nsTraceRefcnt::WalkTheStack(stderr);
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```
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