--- a/mobile/android/chrome/content/aboutDownloads.js
+++ b/mobile/android/chrome/content/aboutDownloads.js
@@ -9,20 +9,16 @@ Cu.import("resource://gre/modules/XPCOMU
 
 XPCOMUtils.defineLazyModuleGetter(this, "Downloads", "resource://gre/modules/Downloads.jsm");
 XPCOMUtils.defineLazyModuleGetter(this, "DownloadUtils", "resource://gre/modules/DownloadUtils.jsm");
 XPCOMUtils.defineLazyModuleGetter(this, "Messaging", "resource://gre/modules/Messaging.jsm");
 XPCOMUtils.defineLazyModuleGetter(this, "OS", "resource://gre/modules/osfile.jsm");
 XPCOMUtils.defineLazyModuleGetter(this, "PluralForm", "resource://gre/modules/PluralForm.jsm");
 XPCOMUtils.defineLazyModuleGetter(this, "Services", "resource://gre/modules/Services.jsm");
 
-var gStrings = Services.strings.createBundle("chrome://browser/locale/aboutDownloads.properties");
-XPCOMUtils.defineLazyGetter(this, "strings",
-                            () => Services.strings.createBundle("chrome://browser/locale/aboutDownloads.properties"));
-
 function deleteDownload(download) {
   download.finalize(true).then(null, Cu.reportError);
   OS.File.remove(download.target.path).then(null, ex => {
     if (!(ex instanceof OS.File.Error && ex.becauseNoSuchFile)) {
       Cu.reportError(ex);
     }
   });
 }
@@ -202,29 +198,30 @@ var downloadLists = {
   },
 
   removeFinished: function () {
     let finished = this.finished;
     if (finished.length == 0) {
       return;
     }
 
-    let title = strings.GetStringFromName("downloadAction.deleteAll");
-    let messageForm = strings.GetStringFromName("downloadMessage.deleteAll");
-    let message = PluralForm.get(finished.length, messageForm).replace("#1", finished.length);
-
-    if (Services.prompt.confirm(null, title, message)) {
-      Downloads.getList(Downloads.ALL)
-               .then(list => {
-                 for (let download of finished) {
-                   list.remove(download).then(null, Cu.reportError);
-                   deleteDownload(download);
-                 }
-               }, Cu.reportError);
-    }
+    document.l10n.get('main').formatValues(
+      'delete-all-title', ['delete-all-message', { num: finished.length }]
+    ).then(([title, message]) => {
+      if (Services.prompt.confirm(null, title, message)) {
+        return Downloads
+          .getList(Downloads.ALL)
+          .then(list => {
+            for (let download of finished) {
+              list.remove(download).then(null, Cu.reportError);
+              deleteDownload(download);
+            }
+          }, Cu.reportError);
+      }
+    });
   }
 };
 
 function DownloadItem(download) {
   this._download = download;
   this._updateFromDownload();
 
   this._domain = DownloadUtils.getURIHost(download.source.url)[0];
@@ -294,19 +291,36 @@ DownloadItem.prototype = {
 
     return element;
   },
 
   updateElement: function (element) {
     element.querySelector(".date").textContent = this.startDate;
     element.querySelector(".domain").textContent = this.domain;
     element.querySelector(".icon").src = this.iconUrl;
-    element.querySelector(".size").textContent = this.size;
-    element.querySelector(".state").textContent = this.stateDescription;
     element.querySelector(".title").setAttribute("value", this.fileName);
+
+    const size = this.size;
+    if (size === undefined) {
+      document.l10n.setAttributes(
+        element.querySelector(".size"),
+        'download-size-unknown'
+      );
+    } else {
+      const elem = element.querySelector(".size");
+      if (elem.hasAttribute('data-l10n-id')) {
+        elem.removeAttribute('data-l10n-id');
+      }
+      elem.textContent = size;
+    }
+
+    document.l10n.setAttributes(
+      element.querySelector(".state"),
+      `download-state-${this.state}`
+    );
   },
 
   onClick: function (event) {
     if (this.download.succeeded) {
       this.download.launch().then(null, Cu.reportError);
     }
   },
 
@@ -330,44 +344,39 @@ DownloadItem.prototype = {
   },
 
   get size() {
     if (this.download.succeeded && this.download.target.exists) {
       return DownloadUtils.convertByteUnits(this.download.target.size).join("");
     } else if (this.download.hasProgress) {
       return DownloadUtils.convertByteUnits(this.download.totalBytes).join("");
     }
-    return strings.GetStringFromName("downloadState.unknownSize");
   },
 
   get startDate() {
     return this._startDate;
   },
 
-  get stateDescription() {
-    let name;
+  get state() {
     if (this.download.error) {
-      name = "downloadState.failed";
+      return "failed";
     } else if (this.download.canceled) {
       if (this.download.hasPartialData) {
-        name = "downloadState.paused";
+        return "paused";
       } else {
-        name = "downloadState.canceled";
+        return "canceled";
       }
     } else if (!this.download.stopped) {
       if (this.download.currentBytes > 0) {
-        name = "downloadState.downloading";
+        return "downloading";
       } else {
-        name = "downloadState.starting";
+        return "starting";
       }
     }
 
-    if (name) {
-      return strings.GetStringFromName(name);
-    }
-    return "";
+    return "unknown";
   }
 };
 
 window.addEventListener("DOMContentLoaded", event => {
     contextMenu.init();
     downloadLists.init()
-});
\ No newline at end of file
+});

--- a/mobile/android/chrome/content/aboutDownloads.xhtml
+++ b/mobile/android/chrome/content/aboutDownloads.xhtml
@@ -1,43 +1,36 @@
 <?xml version="1.0" encoding="UTF-8"?>
 
-<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN"
-  "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd" [
-<!ENTITY % brandDTD SYSTEM "chrome://branding/locale/brand.dtd" >
-%brandDTD;
-<!ENTITY % globalDTD SYSTEM "chrome://global/locale/global.dtd" >
-%globalDTD;
-<!ENTITY % downloadsDTD SYSTEM "chrome://browser/locale/aboutDownloads.dtd" >
-%downloadsDTD;
-]>
-
 <!-- 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/.  -->
 
 <html xmlns="http://www.w3.org/1999/xhtml"
       xmlns:xul="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul">
 <head>
-  <title>&aboutDownloads.title;</title>
+  <title data-l10n-id="title"></title>
   <meta name="viewport" content="width=device-width; user-scalable=0" />
   <link rel="icon" type="image/png" sizes="64x64" href="chrome://branding/content/favicon64.png" />
   <link rel="stylesheet" href="chrome://browser/skin/aboutBase.css" type="text/css"/>
   <link rel="stylesheet" href="chrome://browser/skin/aboutDownloads.css" type="text/css"/>
+
+  <link rel="localization" href="/mobile/aboutDownloads.ftl"/>
+  <script type="application/javascript" src="chrome://global/content/l20n-chrome-html.js"/>
 </head>
 
-<body dir="&locale.dir;">
+<body>
   <menu type="context" id="downloadmenu">
-    <menuitem id="contextmenu-open" label="&aboutDownloads.open;"></menuitem>
-    <menuitem id="contextmenu-retry" label="&aboutDownloads.retry;"></menuitem>
-    <menuitem id="contextmenu-remove" label="&aboutDownloads.remove;"></menuitem>
-    <menuitem id="contextmenu-pause" label="&aboutDownloads.pause;"></menuitem>
-    <menuitem id="contextmenu-resume" label="&aboutDownloads.resume;"></menuitem>
-    <menuitem id="contextmenu-cancel" label="&aboutDownloads.cancel;"></menuitem>
-    <menuitem id="contextmenu-removeall" label="&aboutDownloads.removeAll;"></menuitem>
+    <menuitem id="contextmenu-open" data-l10n-id="open-menuitem"></menuitem>
+    <menuitem id="contextmenu-retry" data-l10n-id="retry-menuitem"></menuitem>
+    <menuitem id="contextmenu-remove" data-l10n-id="remove-menuitem"></menuitem>
+    <menuitem id="contextmenu-pause" data-l10n-id="pause-menuitem"></menuitem>
+    <menuitem id="contextmenu-resume" data-l10n-id="resume-menuitem"></menuitem>
+    <menuitem id="contextmenu-cancel" data-l10n-id="cancel-menuitem"></menuitem>
+    <menuitem id="contextmenu-removeall" data-l10n-id="remove-all-menuitem"></menuitem>
   </menu>
 
   <!--template id="download-item"-->
     <li id="download-item" class="list-item" role="button" contextmenu="downloadmenu" style="display: none">
       <img class="icon" src=""/>
       <div class="details">
         <div class="row">
           <!-- This is a hack so that we can crop this label in its center -->
@@ -47,16 +40,16 @@
         <div class="size"></div>
         <div class="domain"></div>
         <div class="state"></div>
       </div>
     </li>
   <!--/template-->
 
   <div class="header">
-    <div>&aboutDownloads.header;</div>
+    <div data-l10n-id="header"></div>
   </div>
   <ul id="private-downloads-list" class="list"></ul>
   <ul id="public-downloads-list" class="list"></ul>
-  <span id="no-downloads-indicator">&aboutDownloads.empty;</span>
+  <span id="no-downloads-indicator" data-l10n-id="empty"></span>
   <script type="application/javascript;version=1.8" src="chrome://browser/content/aboutDownloads.js"/>
 </body>
 </html>

--- a/mobile/android/installer/package-manifest.in
+++ b/mobile/android/installer/package-manifest.in
@@ -20,16 +20,17 @@
 @BINPATH@/chrome/@AB_CD@.manifest
 @BINPATH@/@PREF_DIR@/mobile-l10n.js
 @BINPATH@/update.locale
 #ifdef MOZ_UPDATER
 @BINPATH@/updater.ini
 #endif
 @BINPATH@/dictionaries/*
 @BINPATH@/hyphenation/*
+@BINPATH@/localization/*
 
 [assets destdir="assets/@ANDROID_CPU_ARCH@"]
 #ifndef MOZ_STATIC_JS
 @BINPATH@/@DLL_PREFIX@mozjs@DLL_SUFFIX@
 #endif
 #ifdef MOZ_DMD
 @BINPATH@/@DLL_PREFIX@dmd@DLL_SUFFIX@
 #endif

deleted file mode 100644
--- a/mobile/android/locales/en-US/chrome/aboutDownloads.dtd
+++ /dev/null
@@ -1,15 +0,0 @@
-<!-- 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/. -->
-
-<!ENTITY aboutDownloads.title                      "Downloads">
-<!ENTITY aboutDownloads.header                     "Your Downloads">
-<!ENTITY aboutDownloads.empty                      "No Downloads">
-
-<!ENTITY aboutDownloads.open                       "Open">
-<!ENTITY aboutDownloads.remove                     "Delete">
-<!ENTITY aboutDownloads.removeAll                  "Delete All">
-<!ENTITY aboutDownloads.pause                      "Pause">
-<!ENTITY aboutDownloads.resume                     "Resume">
-<!ENTITY aboutDownloads.cancel                     "Cancel">
-<!ENTITY aboutDownloads.retry                      "Retry">

deleted file mode 100644
--- a/mobile/android/locales/en-US/chrome/aboutDownloads.properties
+++ /dev/null
@@ -1,17 +0,0 @@
-# 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/.
-
-# LOCALIZATION NOTE (downloadMessage.deleteAll):
-# Semicolon-separated list of plural forms. See:
-# http://developer.mozilla.org/en/docs/Localization_and_Plurals
-downloadMessage.deleteAll=Delete this download?;Delete #1 downloads?
-
-downloadAction.deleteAll=Delete All
-
-downloadState.downloading=Downloading…
-downloadState.canceled=Canceled
-downloadState.failed=Failed
-downloadState.paused=Paused
-downloadState.starting=Starting…
-downloadState.unknownSize=Unknown size

new file mode 100644
--- /dev/null
+++ b/mobile/android/locales/en-US/mobile/aboutDownloads.ftl
@@ -0,0 +1,37 @@
+# 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/.
+
+title  = Downloads
+header = Your Downloads
+empty  = No Downloads
+
+open-menuitem =
+    [html/label] Open
+retry-menuitem =
+    [html/label] Retry
+remove-menuitem =
+    [html/label] Delete
+pause-menuitem =
+    [html/label] Pause
+resume-menuitem =
+    [html/label] Resume
+cancel-menuitem =
+    [html/label] Cancel
+remove-all-menuitem =
+    [html/label] Delete All
+
+delete-all-title   = Delete All
+delete-all-message = { $num ->
+    [1]     Delete this download?
+   *[other] Delete { $num } downloads?
+}
+
+download-state-downloading = Downloading…
+download-state-canceled    = Canceled
+download-state-failed      = Failed
+download-state-paused      = Paused
+download-state-starting    = Starting…
+download-state-unknown     = Unknown
+
+download-size-unknown = Unknown size

--- a/mobile/android/locales/jar.mn
+++ b/mobile/android/locales/jar.mn
@@ -1,24 +1,24 @@
 #filter substitution
 # 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/.
 
+[localization] @AB_CD@.jar:
+  mobile                                          (%mobile/**/*.ftl)
 
 @AB_CD@.jar:
 % locale browser @AB_CD@ %locale/@AB_CD@/browser/
   locale/@AB_CD@/browser/about.dtd                (%chrome/about.dtd)
   locale/@AB_CD@/browser/aboutAccounts.dtd        (%chrome/aboutAccounts.dtd)
   locale/@AB_CD@/browser/aboutAccounts.properties (%chrome/aboutAccounts.properties)
   locale/@AB_CD@/browser/aboutAddons.dtd          (%chrome/aboutAddons.dtd)
   locale/@AB_CD@/browser/aboutAddons.properties   (%chrome/aboutAddons.properties)
   locale/@AB_CD@/browser/aboutCertError.dtd       (%chrome/aboutCertError.dtd)
-  locale/@AB_CD@/browser/aboutDownloads.dtd       (%chrome/aboutDownloads.dtd)
-  locale/@AB_CD@/browser/aboutDownloads.properties (%chrome/aboutDownloads.properties)
   locale/@AB_CD@/browser/aboutHome.dtd            (%chrome/aboutHome.dtd)
   locale/@AB_CD@/browser/aboutHome.properties     (%chrome/aboutHome.properties)
   locale/@AB_CD@/browser/aboutPrivateBrowsing.dtd (%chrome/aboutPrivateBrowsing.dtd)
 #ifdef MOZ_SERVICES_HEALTHREPORT
   locale/@AB_CD@/browser/aboutHealthReport.dtd    (%chrome/aboutHealthReport.dtd)
 #endif
   locale/@AB_CD@/browser/browser.properties       (%chrome/browser.properties)
   locale/@AB_CD@/browser/config.dtd               (%chrome/config.dtd)