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<pre>export XPCOM_DEBUG_BREAK=warn</pre>
That should suppress all pop ups. This is only necessary for windows. Mac and Linux machines should be set to this by default.
===Can't find header GL/glx.h for WebGL===
While running make, the following error presents itself:
<blockquote>
configure: error: Can't find header GL/glx.h for WebGL (install mesa-common-dev (Ubuntu), mesa-libGL-devel (Fedora), or Mesa-devel (openSUSE)))
</blockquote>
'''Answer 1''': This error is most likely caused by an error in your .mozconfig file. Make sure that all commands are prefixed properly with their correct add command (mk_add... or ac_add...)