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diff -up firefox-78.2.0/tools/profiler/gecko/nsProfiler.cpp.zconst firefox-78.2.0/tools/profiler/gecko/nsProfiler.cpp
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--- firefox-78.2.0/tools/profiler/gecko/nsProfiler.cpp.zconst	2020-09-09 20:29:17.489123431 +0200
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+++ firefox-78.2.0/tools/profiler/gecko/nsProfiler.cpp	2020-09-09 20:30:09.544457350 +0200
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@@ -523,7 +523,7 @@ nsProfiler::GetProfileDataAsGzippedArray
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             stream.opaque = nullptr;
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             stream.next_out = (Bytef*)outBuff.Elements();
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             stream.avail_out = outBuff.Length();
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-            stream.next_in = (z_const Bytef*)aResult.Data();
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+            stream.next_in = (Bytef*)aResult.Data();
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             stream.avail_in = aResult.Length();
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             // A windowBits of 31 is the default (15) plus 16 for emitting a