--- a/browser/devtools/netmonitor/netmonitor-view.js
+++ b/browser/devtools/netmonitor/netmonitor-view.js
@@ -487,28 +487,28 @@ create({ constructor: RequestsMenuView, 
       case "status": {
         let node = $(".requests-menu-status", aItem.target);
         node.setAttribute("code", aValue);
         break;
       }
       case "contentSize": {
         let size = (aValue / 1024).toFixed(CONTENT_SIZE_DECIMALS);
         let node = $(".requests-menu-size", aItem.target);
-        node.setAttribute("value", L10N.getFormatStr("networkMenu.size", size));
+        node.setAttribute("value", L10N.getFormatStr("networkMenu.sizeKB", size));
         break;
       }
       case "mimeType": {
         let type = aValue.split(";")[0].split("/")[1] || "?";
         let node = $(".requests-menu-type", aItem.target);
         node.setAttribute("value", CONTENT_MIME_TYPE_ABBREVIATIONS[type] || type);
         break;
       }
       case "totalTime": {
         let node = $(".requests-menu-timings-total", aItem.target);
-        node.setAttribute("value", L10N.getFormatStr("networkMenu.total", aValue));
+        node.setAttribute("value", L10N.getFormatStr("networkMenu.totalMS", aValue));
         break;
       }
     }
   },
 
   /**
    * Creates a waterfall representing timing information in a network request item view.
    *
@@ -853,17 +853,17 @@ create({ constructor: NetworkDetailsView
    *
    * @param string aName
    *        The type of headers to populate (request or response).
    * @param object aResponse
    *        The message received from the server.
    */
   _addHeaders: function NVND__addHeaders(aName, aResponse) {
     let kb = (aResponse.headersSize / 1024).toFixed(HEADERS_SIZE_DECIMALS);
-    let size = L10N.getFormatStr("networkMenu.size", kb);
+    let size = L10N.getFormatStr("networkMenu.sizeKB", kb);
     let headersScope = this._headers.addScope(aName + " (" + size + ")");
     headersScope.expanded = true;
 
     for (let header of aResponse.headers) {
       let headerVar = headersScope.addVar(header.name, { null: true }, true);
       headerVar.setGrip(header.value);
     }
   },
@@ -1078,42 +1078,42 @@ create({ constructor: NetworkDetailsView
 
     let tabboxWidth = $("#details-pane").getAttribute("width");
     let availableWidth = tabboxWidth / 2; // Other nodes also take some space.
     let scale = Math.max(availableWidth / aResponse.totalTime, 0);
 
     $("#timings-summary-blocked .requests-menu-timings-box")
       .setAttribute("width", blocked * scale);
     $("#timings-summary-blocked .requests-menu-timings-total")
-      .setAttribute("value", L10N.getFormatStr("networkMenu.total", blocked));
+      .setAttribute("value", L10N.getFormatStr("networkMenu.totalMS", blocked));
 
     $("#timings-summary-dns .requests-menu-timings-box")
       .setAttribute("width", dns * scale);
     $("#timings-summary-dns .requests-menu-timings-total")
-      .setAttribute("value", L10N.getFormatStr("networkMenu.total", dns));
+      .setAttribute("value", L10N.getFormatStr("networkMenu.totalMS", dns));
 
     $("#timings-summary-connect .requests-menu-timings-box")
       .setAttribute("width", connect * scale);
     $("#timings-summary-connect .requests-menu-timings-total")
-      .setAttribute("value", L10N.getFormatStr("networkMenu.total", connect));
+      .setAttribute("value", L10N.getFormatStr("networkMenu.totalMS", connect));
 
     $("#timings-summary-send .requests-menu-timings-box")
       .setAttribute("width", send * scale);
     $("#timings-summary-send .requests-menu-timings-total")
-      .setAttribute("value", L10N.getFormatStr("networkMenu.total", send));
+      .setAttribute("value", L10N.getFormatStr("networkMenu.totalMS", send));
 
     $("#timings-summary-wait .requests-menu-timings-box")
       .setAttribute("width", wait * scale);
     $("#timings-summary-wait .requests-menu-timings-total")
-      .setAttribute("value", L10N.getFormatStr("networkMenu.total", wait));
+      .setAttribute("value", L10N.getFormatStr("networkMenu.totalMS", wait));
 
     $("#timings-summary-receive .requests-menu-timings-box")
       .setAttribute("width", receive * scale);
     $("#timings-summary-receive .requests-menu-timings-total")
-      .setAttribute("value", L10N.getFormatStr("networkMenu.total", receive));
+      .setAttribute("value", L10N.getFormatStr("networkMenu.totalMS", receive));
 
     $("#timings-summary-dns .requests-menu-timings-box")
       .style.transform = "translateX(" + (scale * blocked) + "px)";
     $("#timings-summary-connect .requests-menu-timings-box")
       .style.transform = "translateX(" + (scale * (blocked + dns)) + "px)";
     $("#timings-summary-send .requests-menu-timings-box")
       .style.transform = "translateX(" + (scale * (blocked + dns + connect)) + "px)";
     $("#timings-summary-wait .requests-menu-timings-box")

--- a/browser/devtools/netmonitor/test/browser_net_content-type.js
+++ b/browser/devtools/netmonitor/test/browser_net_content-type.js
@@ -4,62 +4,62 @@
 /**
  * Tests if different response content types are handled correctly.
  */
 
 function test() {
   initNetMonitor(CONTENT_TYPE_URL).then(([aTab, aDebuggee, aMonitor]) => {
     info("Starting test... ");
 
-    let { document, SourceEditor, NetMonitorView } = aMonitor.panelWin;
+    let { document, L10N, SourceEditor, NetMonitorView } = aMonitor.panelWin;
     let { RequestsMenu } = NetMonitorView;
 
     RequestsMenu.lazyUpdate = false;
 
     waitForNetworkEvents(aMonitor, 6).then(() => {
       verifyRequestItemTarget(RequestsMenu.getItemAtIndex(0),
         "GET", CONTENT_TYPE_SJS + "?fmt=xml", {
           status: 200,
           type: "xml",
-          size: "0.04kb",
+          size: L10N.getFormatStr("networkMenu.sizeKB", 0.04),
           time: true
         });
       verifyRequestItemTarget(RequestsMenu.getItemAtIndex(1),
         "GET", CONTENT_TYPE_SJS + "?fmt=css", {
           status: 200,
           type: "css",
-          size: "0.03kb",
+          size: L10N.getFormatStr("networkMenu.sizeKB", 0.03),
           time: true
         });
       verifyRequestItemTarget(RequestsMenu.getItemAtIndex(2),
         "GET", CONTENT_TYPE_SJS + "?fmt=js", {
           status: 200,
           type: "js",
-          size: "0.03kb",
+          size: L10N.getFormatStr("networkMenu.sizeKB", 0.03),
           time: true
         });
       verifyRequestItemTarget(RequestsMenu.getItemAtIndex(3),
         "GET", CONTENT_TYPE_SJS + "?fmt=json", {
           status: 200,
           type: "json",
-          size: "0.03kb",
+          size: L10N.getFormatStr("networkMenu.sizeKB", 0.03),
           time: true
         });
       verifyRequestItemTarget(RequestsMenu.getItemAtIndex(4),
         "GET", CONTENT_TYPE_SJS + "?fmt=bogus", {
           status: 404,
           type: "html",
-          size: "0.02kb",
+          size: L10N.getFormatStr("networkMenu.sizeKB", 0.02),
           time: true
         });
       verifyRequestItemTarget(RequestsMenu.getItemAtIndex(5),
         "GET", TEST_IMAGE, {
           status: 200,
           type: "png",
-          size: "0.76kb",
+          size: L10N.getFormatStr("networkMenu.sizeKB", 0.76),
           time: true
         });
 
       EventUtils.sendMouseEvent({ type: "mousedown" },
         document.getElementById("details-pane-toggle"));
       EventUtils.sendMouseEvent({ type: "mousedown" },
         document.querySelectorAll("#details-pane tab")[3]);
 

--- a/browser/devtools/netmonitor/test/browser_net_post-data.js
+++ b/browser/devtools/netmonitor/test/browser_net_post-data.js
@@ -15,24 +15,24 @@ function test() {
     RequestsMenu.lazyUpdate = false;
     NetworkDetails._params.lazyEmpty = false;
 
     waitForNetworkEvents(aMonitor, 0, 2).then(() => {
       verifyRequestItemTarget(RequestsMenu.getItemAtIndex(0),
         "POST", SIMPLE_SJS + "?foo=bar&baz=42&type=urlencoded", {
           status: 200,
           type: "plain",
-          size: "0.01kb",
+          size: L10N.getFormatStr("networkMenu.sizeKB", 0.01),
           time: true
         });
       verifyRequestItemTarget(RequestsMenu.getItemAtIndex(1),
         "POST", SIMPLE_SJS + "?foo=bar&baz=42&type=multipart", {
           status: 200,
           type: "plain",
-          size: "0.01kb",
+          size: L10N.getFormatStr("networkMenu.sizeKB", 0.01),
           time: true
         });
 
       EventUtils.sendMouseEvent({ type: "mousedown" },
         document.getElementById("details-pane-toggle"));
       EventUtils.sendMouseEvent({ type: "mousedown" },
         document.querySelectorAll("#details-pane tab")[2]);
 

--- a/browser/devtools/netmonitor/test/browser_net_prefs-and-l10n.js
+++ b/browser/devtools/netmonitor/test/browser_net_prefs-and-l10n.js
@@ -22,18 +22,18 @@ function test() {
 
       let bundleName = "chrome://browser/locale/devtools/netmonitor.properties";
       let stringBundle = Services.strings.createBundle(bundleName);
 
       is(L10N.getStr("netmonitor.label"),
         stringBundle.GetStringFromName("netmonitor.label"),
         "The getStr() method didn't return the expected string.");
 
-      is(L10N.getFormatStr("networkMenu.total", "foo"),
-        stringBundle.formatStringFromName("networkMenu.total", ["foo"], 1),
+      is(L10N.getFormatStr("networkMenu.totalMS", "foo"),
+        stringBundle.formatStringFromName("networkMenu.totalMS", ["foo"], 1),
         "The getFormatStr() method didn't return the expected string.");
     }
 
     function testPrefs() {
       let { Prefs } = aMonitor.panelWin;
 
       is(Prefs.root, "devtools.netmonitor",
         "The preferences object should have a correct root path.");

--- a/browser/devtools/netmonitor/test/browser_net_simple-request-data.js
+++ b/browser/devtools/netmonitor/test/browser_net_simple-request-data.js
@@ -4,17 +4,17 @@
 /**
  * Tests if requests render correct information in the menu UI.
  */
 
 function test() {
   initNetMonitor(SIMPLE_SJS).then(([aTab, aDebuggee, aMonitor]) => {
     info("Starting test... ");
 
-    let { NetMonitorView } = aMonitor.panelWin;
+    let { L10N, NetMonitorView } = aMonitor.panelWin;
     let { RequestsMenu } = NetMonitorView;
 
     RequestsMenu.lazyUpdate = false;
 
     waitForNetworkEvents(aMonitor, 1)
       .then(() => teardown(aMonitor))
       .then(finish);
 
@@ -157,17 +157,17 @@ function test() {
 
       is(requestItem.attachment.contentSize, "12",
         "The contentSize attachment has an incorrect value.");
       is(requestItem.attachment.mimeType, "text/plain; charset=utf-8",
         "The mimeType attachment has an incorrect value.");
 
       verifyRequestItemTarget(requestItem, "GET", SIMPLE_SJS, {
         type: "plain",
-        size: "0.01kb"
+        size: L10N.getFormatStr("networkMenu.sizeKB", 0.01),
       });
     });
 
     aMonitor.panelWin.once("NetMonitor:NetworkEventUpdated:ResponseContent", () => {
       let requestItem = RequestsMenu.getItemAtIndex(0);
 
       ok(requestItem.attachment.responseContent,
         "There should be a responseContent attachment available.");
@@ -175,17 +175,17 @@ function test() {
         "The responseContent attachment has an incorrect |content.mimeType| property.");
       is(requestItem.attachment.responseContent.content.text, "Hello world!",
         "The responseContent attachment has an incorrect |content.text| property.");
       is(requestItem.attachment.responseContent.content.size, 12,
         "The responseContent attachment has an incorrect |content.size| property.");
 
       verifyRequestItemTarget(requestItem, "GET", SIMPLE_SJS, {
         type: "plain",
-        size: "0.01kb"
+        size: L10N.getFormatStr("networkMenu.sizeKB", 0.01),
       });
     });
 
     aMonitor.panelWin.once("NetMonitor:NetworkEventUpdating:EventTimings", () => {
       let requestItem = RequestsMenu.getItemAtIndex(0);
 
       is(typeof requestItem.attachment.totalTime, "number",
         "The attached totalTime is incorrect.");

--- a/browser/devtools/netmonitor/test/browser_net_simple-request-details.js
+++ b/browser/devtools/netmonitor/test/browser_net_simple-request-details.js
@@ -66,17 +66,17 @@ function test() {
       is(tabpanel.querySelectorAll(".variables-view-empty-notice").length, 0,
         "The empty notice should not be displayed in this tabpanel.");
 
       let responseScope = tabpanel.querySelectorAll(".variables-view-scope")[0];
       let requestScope = tabpanel.querySelectorAll(".variables-view-scope")[1];
 
       is(responseScope.querySelector(".name").getAttribute("value"),
         L10N.getStr("responseHeaders") + " (" +
-        L10N.getFormatStr("networkMenu.size", "0.169") + ")",
+        L10N.getFormatStr("networkMenu.sizeKB", "0.169") + ")",
         "The response headers scope doesn't have the correct title.");
 
       ok(requestScope.querySelector(".name").getAttribute("value").contains(
         L10N.getStr("requestHeaders") + " (0."),
         // Can't test for full request headers title because the size may
         // vary across platforms ("User-Agent" header differs).
         "The request headers scope doesn't have the correct title.");
 
@@ -191,35 +191,35 @@ function test() {
 
       let tab = document.querySelectorAll("#details-pane tab")[4];
       let tabpanel = document.querySelectorAll("#details-pane tabpanel")[4];
 
       is(tab.getAttribute("selected"), "true",
         "The timings tab in the network details pane should be selected.");
 
       ok(tabpanel.querySelector("#timings-summary-blocked .requests-menu-timings-total")
-        .getAttribute("value").match(/[0-9]+ms$/),
+        .getAttribute("value").match(/[0-9]+/),
         "The blocked timing info does not appear to be correct.");
 
       ok(tabpanel.querySelector("#timings-summary-dns .requests-menu-timings-total")
-        .getAttribute("value").match(/[0-9]+ms$/),
+        .getAttribute("value").match(/[0-9]+/),
         "The dns timing info does not appear to be correct.");
 
       ok(tabpanel.querySelector("#timings-summary-connect .requests-menu-timings-total")
-        .getAttribute("value").match(/[0-9]+ms$/),
+        .getAttribute("value").match(/[0-9]+/),
         "The connect timing info does not appear to be correct.");
 
       ok(tabpanel.querySelector("#timings-summary-send .requests-menu-timings-total")
-        .getAttribute("value").match(/[0-9]+ms$/),
+        .getAttribute("value").match(/[0-9]+/),
         "The send timing info does not appear to be correct.");
 
       ok(tabpanel.querySelector("#timings-summary-wait .requests-menu-timings-total")
-        .getAttribute("value").match(/[0-9]+ms$/),
+        .getAttribute("value").match(/[0-9]+/),
         "The wait timing info does not appear to be correct.");
 
       ok(tabpanel.querySelector("#timings-summary-receive .requests-menu-timings-total")
-        .getAttribute("value").match(/[0-9]+ms$/),
+        .getAttribute("value").match(/[0-9]+/),
         "The receive timing info does not appear to be correct.");
     }
 
     aDebuggee.location.reload();
   });
 }

--- a/browser/devtools/netmonitor/test/browser_net_status-codes.js
+++ b/browser/devtools/netmonitor/test/browser_net_status-codes.js
@@ -17,45 +17,45 @@ function test() {
 
     waitForNetworkEvents(aMonitor, 5).then(() => {
       let requestItems = [];
 
       verifyRequestItemTarget(requestItems[0] = RequestsMenu.getItemAtIndex(0),
         "GET", STATUS_CODES_SJS + "?sts=100", {
           status: 101,
           type: "plain",
-          size: "0.00kb",
+          size: L10N.getFormatStr("networkMenu.sizeKB", "0.00"),
           time: true
         });
       verifyRequestItemTarget(requestItems[1] = RequestsMenu.getItemAtIndex(1),
         "GET", STATUS_CODES_SJS + "?sts=200", {
           status: 202,
           type: "plain",
-          size: "0.02kb",
+          size: L10N.getFormatStr("networkMenu.sizeKB", 0.02),
           time: true
         });
       verifyRequestItemTarget(requestItems[2] = RequestsMenu.getItemAtIndex(2),
         "GET", STATUS_CODES_SJS + "?sts=300", {
           status: 303,
           type: "plain",
-          size: "0.00kb",
+          size: L10N.getFormatStr("networkMenu.sizeKB", "0.00"),
           time: true
         });
       verifyRequestItemTarget(requestItems[3] = RequestsMenu.getItemAtIndex(3),
         "GET", STATUS_CODES_SJS + "?sts=400", {
           status: 404,
           type: "plain",
-          size: "0.02kb",
+          size: L10N.getFormatStr("networkMenu.sizeKB", 0.02),
           time: true
         });
       verifyRequestItemTarget(requestItems[4] = RequestsMenu.getItemAtIndex(4),
         "GET", STATUS_CODES_SJS + "?sts=500", {
           status: 501,
           type: "plain",
-          size: "0.02kb",
+          size: L10N.getFormatStr("networkMenu.sizeKB", 0.02),
           time: true
         });
 
       // Test summaries...
       EventUtils.sendMouseEvent({ type: "mousedown" },
         document.querySelectorAll("#details-pane tab")[0]);
 
       EventUtils.sendMouseEvent({ type: "mousedown" }, requestItems[0].target);

--- a/browser/locales/en-US/chrome/browser/devtools/netmonitor.properties
+++ b/browser/locales/en-US/chrome/browser/devtools/netmonitor.properties
@@ -85,14 +85,14 @@ requestCookies=Request cookies
 # in the network details params tab identifying the response cookies.
 responseCookies=Response cookies
 
 # LOCALIZATION NOTE (jsonFilterText): This is the text displayed
 # in the response tab of the network details pane for the JSON filtering input.
 jsonFilterText=Filter properties
 
 # LOCALIZATION NOTE (networkMenu.size): This is the label displayed
-# in the network menu specifying the size of a request (in kb).
-networkMenu.size=%Skb
+# in the network menu specifying the size of a request (in kilobytes).
+networkMenu.sizeKB=%S KB
 
 # LOCALIZATION NOTE (networkMenu.total): This is the label displayed
-# in the network menu specifying the time for a request to finish (in ms).
-networkMenu.total=→ %Sms
+# in the network menu specifying the time for a request to finish (in milliseconds).
+networkMenu.totalMS=→ %S ms