new file mode 100644
--- /dev/null
+++ b/python/devtools/migrate-l10n/README.rst
@@ -0,0 +1,16 @@
+devtools-l10n-migration script
+==============================
+
+For devtools.html, devtools will no longer rely on DTD files. This migration
+script is aimed at localizers to automate the migration of strings from DTD to
+properties files.
+
+How to run this script?
+
+To migrate all configuration files:
+  python migrate/main.py path/to/your/l10n/repo/ -c migrate/conf/
+
+To migrate only one configuration file:
+  python migrate/main.py path/to/your/l10n/repo/ -c migrate/conf/bug1294186
+
+All configuration files should be named after the bug where specific devtools strings were migrated.

new file mode 100644

new file mode 100644
--- /dev/null
+++ b/python/devtools/migrate-l10n/migrate/conf/bug1294186
@@ -0,0 +1,22 @@
+font-inspector.properties:fontinspector.seeAll.tooltip = font-inspector.dtd:showAllFonts
+font-inspector.properties:fontinspector.seeAll = font-inspector.dtd:showAllFontsUsed
+font-inspector.properties:fontinspector.usedAs = font-inspector.dtd:usedAs
+font-inspector.properties:fontinspector.system = font-inspector.dtd:system
+font-inspector.properties:fontinspector.remote = font-inspector.dtd:remote
+font-inspector.properties:fontinspector.previewText = font-inspector.dtd:previewHint
+
+inspector.properties:inspector.eyedropper.label = inspector.dtd:inspectorEyeDropper.label
+inspector.properties:inspector.breadcrumbs.label = inspector.dtd:inspectorBreadcrumbsGroup
+
+boxmodel.properties:boxmodel.title = layoutview.dtd:layoutViewTitle
+boxmodel.properties:boxmodel.margin = layoutview.dtd:margin.tooltip
+boxmodel.properties:boxmodel.padding = layoutview.dtd:padding.tooltip
+boxmodel.properties:boxmodel.border = layoutview.dtd:border.tooltip
+boxmodel.properties:boxmodel.content = layoutview.dtd:content.tooltip
+boxmodel.properties:boxmodel.geometryButton.tooltip = layoutview.dtd:geometry.button.tooltip
+
+inspector.properties:inspector.browserStyles.label = styleinspector.dtd:browserStylesLabel
+inspector.properties:inspector.filterStyles.placeholder = styleinspector.dtd:filterStylesPlaceholder
+inspector.properties:inspector.addRule.tooltip = styleinspector.dtd:addRuleButtonTooltip
+inspector.properties:inspector.togglePseudo.tooltip = styleinspector.dtd:togglePseudoClassPanel
+inspector.properties:inspector.noProperties = styleinspector.dtd:noPropertiesFound

new file mode 100644
--- /dev/null
+++ b/python/devtools/migrate-l10n/migrate/conf/bug1308500
@@ -0,0 +1,98 @@
+netmonitor.properties:netmonitor.perfNotice1 = netmonitor.dtd:netmonitorUI.perfNotice1
+netmonitor.properties:netmonitor.perfNotice2 = netmonitor.dtd:netmonitorUI.perfNotice2
+netmonitor.properties:netmonitor.perfNotice3 = netmonitor.dtd:netmonitorUI.perfNotice3
+netmonitor.properties:netmonitor.reloadNotice1 = netmonitor.dtd:netmonitorUI.reloadNotice1
+netmonitor.properties:netmonitor.reloadNotice2 = netmonitor.dtd:netmonitorUI.reloadNotice2
+netmonitor.properties:netmonitor.reloadNotice3 = netmonitor.dtd:netmonitorUI.reloadNotice3
+netmonitor.properties:netmonitor.toolbar.status3 = netmonitor.dtd:netmonitorUI.toolbar.status3
+netmonitor.properties:netmonitor.toolbar.method = netmonitor.dtd:netmonitorUI.toolbar.method
+netmonitor.properties:netmonitor.toolbar.file = netmonitor.dtd:netmonitorUI.toolbar.file
+netmonitor.properties:netmonitor.toolbar.domain = netmonitor.dtd:netmonitorUI.toolbar.domain
+netmonitor.properties:netmonitor.toolbar.cause = netmonitor.dtd:netmonitorUI.toolbar.cause
+netmonitor.properties:netmonitor.toolbar.type = netmonitor.dtd:netmonitorUI.toolbar.type
+netmonitor.properties:netmonitor.toolbar.transferred = netmonitor.dtd:netmonitorUI.toolbar.transferred
+netmonitor.properties:netmonitor.toolbar.size = netmonitor.dtd:netmonitorUI.toolbar.size
+netmonitor.properties:netmonitor.toolbar.waterfall = netmonitor.dtd:netmonitorUI.toolbar.waterfall
+netmonitor.properties:netmonitor.tab.headers = netmonitor.dtd:netmonitorUI.tab.headers
+netmonitor.properties:netmonitor.tab.cookies = netmonitor.dtd:netmonitorUI.tab.cookies
+netmonitor.properties:netmonitor.tab.params = netmonitor.dtd:netmonitorUI.tab.params
+netmonitor.properties:netmonitor.tab.response = netmonitor.dtd:netmonitorUI.tab.response
+netmonitor.properties:netmonitor.tab.timings = netmonitor.dtd:netmonitorUI.tab.timings
+netmonitor.properties:netmonitor.tab.preview = netmonitor.dtd:netmonitorUI.tab.preview
+netmonitor.properties:netmonitor.tab.security = netmonitor.dtd:netmonitorUI.tab.security
+netmonitor.properties:netmonitor.footer.filterAll = netmonitor.dtd:netmonitorUI.footer.filterAll
+netmonitor.properties:netmonitor.footer.filterHTML = netmonitor.dtd:netmonitorUI.footer.filterHTML
+netmonitor.properties:netmonitor.footer.filterCSS = netmonitor.dtd:netmonitorUI.footer.filterCSS
+netmonitor.properties:netmonitor.footer.filterJS = netmonitor.dtd:netmonitorUI.footer.filterJS
+netmonitor.properties:netmonitor.footer.filterXHR = netmonitor.dtd:netmonitorUI.footer.filterXHR
+netmonitor.properties:netmonitor.footer.filterFonts = netmonitor.dtd:netmonitorUI.footer.filterFonts
+netmonitor.properties:netmonitor.footer.filterImages = netmonitor.dtd:netmonitorUI.footer.filterImages
+netmonitor.properties:netmonitor.footer.filterMedia = netmonitor.dtd:netmonitorUI.footer.filterMedia
+netmonitor.properties:netmonitor.footer.filterFlash = netmonitor.dtd:netmonitorUI.footer.filterFlash
+netmonitor.properties:netmonitor.footer.filterWS = netmonitor.dtd:netmonitorUI.footer.filterWS
+netmonitor.properties:netmonitor.footer.filterOther = netmonitor.dtd:netmonitorUI.footer.filterOther
+netmonitor.properties:netmonitor.footer.filterFreetext.label = netmonitor.dtd:netmonitorUI.footer.filterFreetext.label
+netmonitor.properties:netmonitor.footer.filterFreetext.key = netmonitor.dtd:netmonitorUI.footer.filterFreetext.key
+netmonitor.properties:netmonitor.footer.clear = netmonitor.dtd:netmonitorUI.footer.clear
+netmonitor.properties:netmonitor.footer.perf = netmonitor.dtd:netmonitorUI.footer.perf
+netmonitor.properties:netmonitor.panesButton.tooltip = netmonitor.dtd:netmonitorUI.panesButton.tooltip
+netmonitor.properties:netmonitor.summary.url = netmonitor.dtd:netmonitorUI.summary.url
+netmonitor.properties:netmonitor.summary.method = netmonitor.dtd:netmonitorUI.summary.method
+netmonitor.properties:netmonitor.summary.address = netmonitor.dtd:netmonitorUI.summary.address
+netmonitor.properties:netmonitor.summary.status = netmonitor.dtd:netmonitorUI.summary.status
+netmonitor.properties:netmonitor.summary.version = netmonitor.dtd:netmonitorUI.summary.version
+netmonitor.properties:netmonitor.summary.editAndResend = netmonitor.dtd:netmonitorUI.summary.editAndResend
+netmonitor.properties:netmonitor.summary.rawHeaders = netmonitor.dtd:netmonitorUI.summary.rawHeaders
+netmonitor.properties:netmonitor.summary.rawHeaders.requestHeaders = netmonitor.dtd:netmonitorUI.summary.rawHeaders.requestHeaders
+netmonitor.properties:netmonitor.summary.rawHeaders.responseHeaders = netmonitor.dtd:netmonitorUI.summary.rawHeaders.responseHeaders
+netmonitor.properties:netmonitor.summary.size = netmonitor.dtd:netmonitorUI.summary.size
+netmonitor.properties:netmonitor.response.name = netmonitor.dtd:netmonitorUI.response.name
+netmonitor.properties:netmonitor.response.dimensions = netmonitor.dtd:netmonitorUI.response.dimensions
+netmonitor.properties:netmonitor.response.mime = netmonitor.dtd:netmonitorUI.response.mime
+netmonitor.properties:netmonitor.timings.blocked = netmonitor.dtd:netmonitorUI.timings.blocked
+netmonitor.properties:netmonitor.timings.dns = netmonitor.dtd:netmonitorUI.timings.dns
+netmonitor.properties:netmonitor.timings.connect = netmonitor.dtd:netmonitorUI.timings.connect
+netmonitor.properties:netmonitor.timings.send = netmonitor.dtd:netmonitorUI.timings.send
+netmonitor.properties:netmonitor.timings.wait = netmonitor.dtd:netmonitorUI.timings.wait
+netmonitor.properties:netmonitor.timings.receive = netmonitor.dtd:netmonitorUI.timings.receive
+netmonitor.properties:netmonitor.security.warning.cipher = netmonitor.dtd:netmonitorUI.security.warning.cipher
+netmonitor.properties:netmonitor.security.error = netmonitor.dtd:netmonitorUI.security.error
+netmonitor.properties:netmonitor.security.protocolVersion = netmonitor.dtd:netmonitorUI.security.protocolVersion
+netmonitor.properties:netmonitor.security.cipherSuite = netmonitor.dtd:netmonitorUI.security.cipherSuite
+netmonitor.properties:netmonitor.security.hsts = netmonitor.dtd:netmonitorUI.security.hsts
+netmonitor.properties:netmonitor.security.hpkp = netmonitor.dtd:netmonitorUI.security.hpkp
+netmonitor.properties:netmonitor.security.connection = netmonitor.dtd:netmonitorUI.security.connection
+netmonitor.properties:netmonitor.security.certificate = netmonitor.dtd:netmonitorUI.security.certificate
+netmonitor.properties:netmonitor.context.copyUrl = netmonitor.dtd:netmonitorUI.context.copyUrl
+netmonitor.properties:netmonitor.context.copyUrl.accesskey = netmonitor.dtd:netmonitorUI.context.copyUrl.accesskey
+netmonitor.properties:netmonitor.context.copyUrlParams = netmonitor.dtd:netmonitorUI.context.copyUrlParams
+netmonitor.properties:netmonitor.context.copyUrlParams.accesskey = netmonitor.dtd:netmonitorUI.context.copyUrlParams.accesskey
+netmonitor.properties:netmonitor.context.copyPostData = netmonitor.dtd:netmonitorUI.context.copyPostData
+netmonitor.properties:netmonitor.context.copyPostData.accesskey = netmonitor.dtd:netmonitorUI.context.copyPostData.accesskey
+netmonitor.properties:netmonitor.context.copyAsCurl = netmonitor.dtd:netmonitorUI.context.copyAsCurl
+netmonitor.properties:netmonitor.context.copyAsCurl.accesskey = netmonitor.dtd:netmonitorUI.context.copyAsCurl.accesskey
+netmonitor.properties:netmonitor.context.copyRequestHeaders = netmonitor.dtd:netmonitorUI.context.copyRequestHeaders
+netmonitor.properties:netmonitor.context.copyRequestHeaders.accesskey = netmonitor.dtd:netmonitorUI.context.copyRequestHeaders.accesskey
+netmonitor.properties:netmonitor.context.copyResponseHeaders = netmonitor.dtd:netmonitorUI.context.copyResponseHeaders
+netmonitor.properties:netmonitor.context.copyResponseHeaders.accesskey = netmonitor.dtd:netmonitorUI.context.copyResponseHeaders.accesskey
+netmonitor.properties:netmonitor.context.copyResponse = netmonitor.dtd:netmonitorUI.context.copyResponse
+netmonitor.properties:netmonitor.context.copyResponse.accesskey = netmonitor.dtd:netmonitorUI.context.copyResponse.accesskey
+netmonitor.properties:netmonitor.context.copyImageAsDataUri = netmonitor.dtd:netmonitorUI.context.copyImageAsDataUri
+netmonitor.properties:netmonitor.context.copyImageAsDataUri.accesskey = netmonitor.dtd:netmonitorUI.context.copyImageAsDataUri.accesskey
+netmonitor.properties:netmonitor.context.copyAllAsHar = netmonitor.dtd:netmonitorUI.context.copyAllAsHar
+netmonitor.properties:netmonitor.context.copyAllAsHar.accesskey = netmonitor.dtd:netmonitorUI.context.copyAllAsHar.accesskey
+netmonitor.properties:netmonitor.context.saveAllAsHar = netmonitor.dtd:netmonitorUI.context.saveAllAsHar
+netmonitor.properties:netmonitor.context.saveAllAsHar.accesskey = netmonitor.dtd:netmonitorUI.context.saveAllAsHar.accesskey
+netmonitor.properties:netmonitor.context.editAndResend = netmonitor.dtd:netmonitorUI.summary.editAndResend
+netmonitor.properties:netmonitor.context.editAndResend.accesskey = netmonitor.dtd:netmonitorUI.summary.editAndResend.accesskey
+netmonitor.properties:netmonitor.context.newTab = netmonitor.dtd:netmonitorUI.context.newTab
+netmonitor.properties:netmonitor.context.newTab.accesskey = netmonitor.dtd:netmonitorUI.context.newTab.accesskey
+netmonitor.properties:netmonitor.context.perfTools = netmonitor.dtd:netmonitorUI.context.perfTools
+netmonitor.properties:netmonitor.context.perfTools.accesskey = netmonitor.dtd:netmonitorUI.context.perfTools.accesskey
+netmonitor.properties:netmonitor.custom.newRequest = netmonitor.dtd:netmonitorUI.custom.newRequest
+netmonitor.properties:netmonitor.custom.query = netmonitor.dtd:netmonitorUI.custom.query
+netmonitor.properties:netmonitor.custom.headers = netmonitor.dtd:netmonitorUI.custom.headers
+netmonitor.properties:netmonitor.custom.postData = netmonitor.dtd:netmonitorUI.custom.postData
+netmonitor.properties:netmonitor.custom.send = netmonitor.dtd:netmonitorUI.custom.send
+netmonitor.properties:netmonitor.custom.cancel = netmonitor.dtd:netmonitorUI.custom.cancel
+netmonitor.properties:netmonitor.backButton = netmonitor.dtd:netmonitorUI.backButton
\ No newline at end of file

new file mode 100644
--- /dev/null
+++ b/python/devtools/migrate-l10n/migrate/main.py
@@ -0,0 +1,261 @@
+import argparse
+import glob
+import HTMLParser
+import logging
+import os
+import re
+import sys
+import urllib2
+
+
+# Import compare-locales parser from parent folder.
+script_path = os.path.dirname(os.path.realpath(__file__))
+compare_locales_path = os.path.join(script_path, '../../../compare-locales')
+sys.path.insert(0, compare_locales_path)
+from compare_locales import parser
+
+
+# Configure logging format and level
+logging.basicConfig(format='  [%(levelname)s] %(message)s', level=logging.INFO)
+
+
+# License header to use when creating new properties files.
+DEFAULT_HEADER = ('# This Source Code Form is subject to the terms of the '
+                  'Mozilla Public\n# License, v. 2.0. If a copy of the MPL '
+                  'was not distributed with this\n# file, You can obtain '
+                  'one at http://mozilla.org/MPL/2.0/.\n')
+
+
+# Base url to retrieve properties files on central, that will be parsed for
+# localization notes.
+CENTRAL_BASE_URL = ('https://hg.mozilla.org/'
+                    'mozilla-central/raw-file/tip/'
+                    'devtools/client/locales/en-US/')
+
+
+# HTML parser to translate HTML entities in dtd files.
+HTML_PARSER = HTMLParser.HTMLParser()
+
+# Cache to store properties files retrieved over the network.
+central_prop_cache = {}
+
+# Cache the parsed entities from the existing DTD files.
+dtd_entities_cache = {}
+
+
+# Retrieve the content of the current version of a properties file for the
+# provided filename, from devtools/client on mozilla central. Will return an
+# empty array if the file can't be retrieved or read.
+def get_central_prop_content(prop_filename):
+    if prop_filename in central_prop_cache:
+        return central_prop_cache[prop_filename]
+
+    url = CENTRAL_BASE_URL + prop_filename
+    logging.info('loading localization file from central: {%s}' % url)
+
+    try:
+        central_prop_cache[prop_filename] = urllib2.urlopen(url).readlines()
+    except:
+        logging.error('failed to load properties file from central: {%s}'
+                      % url)
+        central_prop_cache[prop_filename] = []
+
+    return central_prop_cache[prop_filename]
+
+
+# Retrieve the current en-US localization notes for the provided prop_name.
+def get_localization_note(prop_name, prop_filename):
+    prop_content = get_central_prop_content(prop_filename)
+
+    comment_buffer = []
+    for i, line in enumerate(prop_content):
+        # Remove line breaks.
+        line = line.strip('\n').strip('\r')
+
+        if line.startswith('#'):
+            # Comment line, add to the current comment buffer.
+            comment_buffer.append(line)
+        elif re.search('(^|\n)' + re.escape(prop_name) + '\s*=', line):
+            # Property found, the current comment buffer is the localization
+            # note.
+            break;
+        else:
+            # No match, not a comment, reinitialize the comment buffer.
+            comment_buffer = []
+
+    return '\n'.join(comment_buffer)
+
+
+# Retrieve the parsed DTD entities for a provided path. Results are cached by
+# dtd path.
+def get_dtd_entities(dtd_path):
+    if dtd_path in dtd_entities_cache:
+        return dtd_entities_cache[dtd_path]
+
+    dtd_parser = parser.getParser('.dtd')
+    dtd_parser.readFile(dtd_path)
+    dtd_entities_cache[dtd_path] = dtd_parser.parse()
+    return dtd_entities_cache[dtd_path]
+
+
+# Extract the value of an entity in a dtd file.
+def get_translation_from_dtd(dtd_path, entity_name):
+    entities, map = get_dtd_entities(dtd_path)
+    if entity_name not in map:
+        # Bail out if translation is missing.
+        return
+
+    key = map[entity_name]
+    entity = entities[key]
+    translation = HTML_PARSER.unescape(entity.val)
+    return translation.encode('utf-8')
+
+
+# Extract the header and file wide comments for the provided properties file
+# filename.
+def get_properties_header(prop_filename):
+    prop_content = get_central_prop_content(prop_filename)
+
+    # if the file content is empty, return the default license header.
+    if len(prop_content) == 0:
+        return DEFAULT_HEADER
+
+    header_buffer = []
+    for i, line in enumerate(prop_content):
+        # remove line breaks.
+        line = line.strip('\n').strip('\r')
+
+        # regexp matching keys extracted form parser.py.
+        is_entity_line = re.search('^(\s*)'
+                                   '((?:[#!].*?\n\s*)*)'
+                                   '([^#!\s\n][^=:\n]*?)\s*[:=][ \t]*', line)
+        is_loc_note = re.search('^(\s*)'
+                                '\#\s*LOCALIZATION NOTE\s*\([^)]+\)', line)
+        if is_entity_line or is_loc_note:
+            # header finished, break the loop.
+            break
+        else:
+            # header line, add to the current buffer.
+            header_buffer.append(line)
+
+    # concatenate the current buffer and return.
+    return '\n'.join(header_buffer)
+
+
+# Create a new properties file at the provided path.
+def create_properties_file(prop_path):
+    logging.info('creating new *.properties file: {%s}' % prop_path)
+
+    prop_filename = os.path.basename(prop_path)
+    header = get_properties_header(prop_filename)
+
+    prop_file = open(prop_path, 'w+')
+    prop_file.write(header)
+    prop_file.close()
+
+
+# Migrate a single string entry for a dtd to a properties file.
+def migrate_string(dtd_path, prop_path, dtd_name, prop_name):
+    if not os.path.isfile(dtd_path):
+        logging.error('dtd file can not be found at: {%s}' % dtd_path)
+        return
+
+    translation = get_translation_from_dtd(dtd_path, dtd_name)
+    if not translation:
+        logging.error('translation could not be found for: {%s} in {%s}'
+                      % (dtd_name, dtd_path))
+        return
+
+    # Create properties file if missing.
+    if not os.path.isfile(prop_path):
+        create_properties_file(prop_path)
+
+    if not os.path.isfile(prop_path):
+        logging.error('could not create new properties file at: {%s}'
+                      % prop_path)
+        return
+
+    prop_line = prop_name + '=' + translation + '\n'
+
+    # Skip the string if it already exists in the destination file.
+    prop_file_content = open(prop_path, 'r').read()
+    if prop_line in prop_file_content:
+        logging.warning('string already migrated, skipping: {%s}' % prop_name)
+        return
+
+    # Skip the string and log an error if an existing entry is found, but with
+    # a different value.
+    if re.search('(^|\n)' + re.escape(prop_name) + '\s*=', prop_file_content):
+        logging.error('existing string found, skipping: {%s}' % prop_name)
+        return
+
+    prop_filename = os.path.basename(prop_path)
+    logging.info('migrating {%s} in {%s}' % (prop_name, prop_filename))
+    with open(prop_path, 'a') as prop_file:
+        localization_note = get_localization_note(prop_name, prop_filename)
+        if len(localization_note):
+            prop_file.write('\n' + localization_note)
+        else:
+            logging.warning('localization notes could not be found for: {%s}'
+                            % prop_name)
+        prop_file.write('\n' + prop_line)
+
+
+# Apply the migration instructions in the provided configuration file.
+def migrate_conf(conf_path, l10n_path):
+    f = open(conf_path, 'r')
+    lines = f.readlines()
+    f.close()
+
+    for i, line in enumerate(lines):
+        # Remove line breaks.
+        line = line.strip('\n').strip('\r')
+
+        # Skip invalid lines.
+        if ' = ' not in line:
+            continue
+
+        # Expected syntax: ${prop_path}:${prop_name} = ${dtd_path}:${dtd_name}.
+        prop_info, dtd_info = line.split(' = ')
+        prop_path, prop_name = prop_info.split(':')
+        dtd_path, dtd_name = dtd_info.split(':')
+
+        dtd_path = os.path.join(l10n_path, dtd_path)
+        prop_path = os.path.join(l10n_path, prop_path)
+
+        migrate_string(dtd_path, prop_path, dtd_name, prop_name)
+
+
+def main():
+    # Read command line arguments.
+    arg_parser = argparse.ArgumentParser(
+            description='Migrate devtools localized strings.')
+    arg_parser.add_argument('path', type=str, help='path to l10n repository')
+    arg_parser.add_argument('-c', '--config', type=str,
+                            help='path to configuration file or folder')
+    args = arg_parser.parse_args()
+
+    # Retrieve path to devtools localization files in l10n repository.
+    devtools_l10n_path = os.path.join(args.path, 'devtools/client/')
+    if not os.path.exists(devtools_l10n_path):
+        logging.error('l10n path is invalid: {%s}' % devtools_l10n_path)
+        exit()
+    logging.info('l10n path is valid: {%s}' % devtools_l10n_path)
+
+    # Retrieve configuration files to apply.
+    if os.path.isdir(args.config):
+        conf_files = glob.glob(args.config + '*')
+    elif os.path.isfile(args.config):
+        conf_files = [args.config]
+    else:
+        logging.error('config path is invalid: {%s}' % args.config)
+        exit()
+
+    # Perform migration for each configuration file.
+    for conf_file in conf_files:
+        logging.info('performing migration for config file: {%s}' % conf_file)
+        migrate_conf(conf_file, devtools_l10n_path)
+
+
+if __name__ == '__main__':
+    main()

new file mode 100644