import changes from tenfourfox:

- fix M1607443 as a precaution (b8657e696)
- #369: add back build system changes [partly] (a7ee0d3a4)
- revert #489 (#576): enable CHACHA20/POLY1305, remove TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256 as it is no longer needed [partly] (581cb94a7)
- closes #585: check parse-on-load is enabled first (0d448f2ba)
- #587: M1513855 M1596668 M1602944 M1599420 M1595399 (35a4358b3)
- #585: derp (71110bf96)
- #587: update TLDs, certs, pins, etc. (35584e5e6)
- #369: bustage fix for opt builds (cc2e336b2)

xpcom/io/nsLocalFileUnix.cpp

@@ -1570,6 +1570,9 @@ nsLocalFile::IsExecutable(bool* aResult)
     // Search for any of the set of executable extensions.
     static const char* const executableExts[] = {
       "air",  // Adobe AIR installer
+#ifdef MOZ_WIDGET_COCOA
+      "fileloc",  // File location files can be used to point to other files.
+#endif
       "jar"   // java application bundle
     };
     nsDependentSubstring ext = Substring(path, dotIdx + 1);