diff --git a/toolkit/components/telemetry/ScalarInfo.h b/toolkit/components/telemetry/ScalarInfo.h
index 6c9d8aade7bc..9d7729c5d8ef 100644
--- a/toolkit/components/telemetry/ScalarInfo.h
+++ b/toolkit/components/telemetry/ScalarInfo.h
@@ -6,17 +6,30 @@
 #ifndef TelemetryScalarInfo_h__
 #define TelemetryScalarInfo_h__
 
+#include "nsXULAppAPI.h"
+
 // This module is internal to Telemetry. It defines a structure that holds the
 // scalar info. It should only be used by TelemetryScalarData.h automatically
 // generated file and TelemetryScalar.cpp. This should not be used anywhere else.
 // For the public interface to Telemetry functionality, see Telemetry.h.
 
 namespace {
+
+enum class RecordedProcessType : uint32_t {
+  Main       = (1 << GeckoProcessType_Default),  // Also known as "parent process"
+  Content    = (1 << GeckoProcessType_Content),
+  Gpu        = (1 << GeckoProcessType_GPU),
+  AllChilds  = 0xFFFFFFFF - 1,  // All the children processes (i.e. content, gpu, ...)
+  All        = 0xFFFFFFFF       // All the processes
+};
+MOZ_MAKE_ENUM_CLASS_BITWISE_OPERATORS(RecordedProcessType)
+
 struct ScalarInfo {
   uint32_t kind;
   uint32_t name_offset;
   uint32_t expiration_offset;
   uint32_t dataset;
+  RecordedProcessType record_in_processes;
   bool keyed;
 
   const char *name() const;
diff --git a/toolkit/components/telemetry/gen-scalar-data.py b/toolkit/components/telemetry/gen-scalar-data.py
index 6c17c602f8d3..cfdc12f3036a 100644
--- a/toolkit/components/telemetry/gen-scalar-data.py
+++ b/toolkit/components/telemetry/gen-scalar-data.py
@@ -40,11 +40,12 @@ def write_scalar_info(scalar, output, name_index, expiration_index):
     if cpp_guard:
         print("#if defined(%s)" % cpp_guard, file=output)
 
-    print("  {{ {}, {}, {}, {}, {} }},"\
+    print("  {{ {}, {}, {}, {}, {}, {} }},"\
           .format(scalar.nsITelemetry_kind,
                   name_index,
                   expiration_index,
                   scalar.dataset,
+                  " | ".join(scalar.record_in_processes_enum),
                   "true" if scalar.keyed else "false"),
           file=output)
 
diff --git a/toolkit/components/telemetry/parse_scalars.py b/toolkit/components/telemetry/parse_scalars.py
index a560a30139a0..b9bae3545961 100644
--- a/toolkit/components/telemetry/parse_scalars.py
+++ b/toolkit/components/telemetry/parse_scalars.py
@@ -14,6 +14,16 @@ SCALAR_TYPES_MAP = {
     'boolean': 'nsITelemetry::SCALAR_BOOLEAN'
 }
 
+# This is a list of flags that determine which process the scalar is allowed
+# to record from.
+KNOWN_PROCESS_FLAGS = {
+    'all': 'RecordedProcessType::All',
+    'all_childs': 'RecordedProcessType::AllChilds',
+    'main': 'RecordedProcessType::Main',
+    'content': 'RecordedProcessType::Content',
+    'gpu': 'RecordedProcessType::Gpu',
+}
+
 class ScalarType:
     """A class for representing a scalar definition."""
 
@@ -87,13 +97,15 @@ class ScalarType:
         OPTIONAL_FIELDS = {
             'cpp_guard': basestring,
             'release_channel_collection': basestring,
-            'keyed': bool
+            'keyed': bool,
+            'record_in_processes': list,
         }
 
         # The types for the data within the fields that hold lists.
         LIST_FIELDS_CONTENT = {
             'bug_numbers': int,
-            'notification_emails': basestring
+            'notification_emails': basestring,
+            'record_in_processes': basestring,
         }
 
         # Concatenate the required and optional field definitions.
@@ -153,6 +165,12 @@ class ScalarType:
         if cpp_guard and re.match(r'\W', cpp_guard):
             raise ValueError(self._name + ' - invalid cpp_guard: ' + cpp_guard)
 
+        # Validate record_in_processes.
+        record_in_processes = definition.get('record_in_processes', [])
+        for proc in record_in_processes:
+            if proc not in KNOWN_PROCESS_FLAGS.keys():
+                raise ValueError(self._name + ' - unknown value in record_in_processes: ' + proc)
+
     @property
     def name(self):
         """Get the scalar name"""
@@ -208,6 +226,16 @@ class ScalarType:
         """Get the list of notification emails"""
         return self._definition['notification_emails']
 
+    @property
+    def record_in_processes(self):
+        """Get the non-empty list of processes to record data in"""
+        return self._definition.get('record_in_processes', ['main'])
+
+    @property
+    def record_in_processes_enum(self):
+        """Get the non-empty list of flags representing the processes to record data in"""
+        return [KNOWN_PROCESS_FLAGS.get(p) for p in self.record_in_processes]
+
     @property
     def dataset(self):
         """Get the nsITelemetry constant equivalent to the chose release channel collection