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-rw-r--r--python/mozbuild/mozbuild/base.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/python/mozbuild/mozbuild/base.py b/python/mozbuild/mozbuild/base.py
index a50b8ff890..9ca6890098 100644
--- a/python/mozbuild/mozbuild/base.py
+++ b/python/mozbuild/mozbuild/base.py
@@ -740,7 +740,7 @@ class MachCommandConditions(object):
def is_firefox(cls):
"""Must have a Firefox build."""
if hasattr(cls, 'substs'):
- return cls.substs.get('MOZ_BUILD_APP') == 'browser'
+ return cls.substs.get('MOZ_PHOENIX') == 1
return False
@staticmethod