diff -r 000000000000 -r 6474c204b198 toolkit/components/telemetry/gen-histogram-bucket-ranges.py
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/toolkit/components/telemetry/gen-histogram-bucket-ranges.py	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,56 @@
+#!/usr/bin/env python
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+# Write out detailed histogram information, including the ranges of the
+# buckets specified by each histogram.
+
+import sys
+import re
+import histogram_tools
+import json
+
+from collections import OrderedDict
+
+# Keep this in sync with TelemetryPing.
+startup_histogram_re = re.compile("SQLITE|HTTP|SPDY|CACHE|DNS")
+
+def main(argv):
+    filename = argv[0]
+    all_histograms = OrderedDict()
+
+    for histogram in histogram_tools.from_file(filename):
+        name = histogram.name()
+        parameters = OrderedDict()
+        table = {
+            'boolean': '2',
+            'flag': '3',
+            'enumerated': '1',
+            'linear': '1',
+            'exponential': '0'
+            }
+        # Use __setitem__ because Python lambdas are so limited.
+        histogram_tools.table_dispatch(histogram.kind(), table,
+                                       lambda k: parameters.__setitem__('kind', k))
+        if histogram.low() == 0:
+            parameters['min'] = 1
+        else:
+            parameters['min'] = histogram.low()
+
+        try:
+            buckets = histogram.ranges()
+            parameters['buckets'] = buckets
+            parameters['max'] = buckets[-1]
+            parameters['bucket_count'] = len(buckets)
+        except histogram_tools.DefinitionException:
+            continue
+
+        all_histograms.update({ name: parameters });
+
+        if startup_histogram_re.search(name) is not None:
+            all_histograms.update({ "STARTUP_" + name: parameters })
+
+    print json.dumps({ 'histograms': all_histograms})
+
+main(sys.argv[1:])