--- a/browser/config/tooltool-manifests/linux32/releng.manifest
+++ b/browser/config/tooltool-manifests/linux32/releng.manifest
@@ -3,16 +3,16 @@
     "size": 11189216,
     "digest": "18bc52b0599b1308b667e282abb45f47597bfc98a5140cfcab8da71dacf89dd76d0dee22a04ce26fe7ad1f04e2d6596991f9e5b01fd2aaaab5542965f596b0e6",
     "algorithm": "sha512",
     "filename": "gtk3.tar.xz",
     "setup": "setup.sh",
     "unpack": true
   },
   {
-    "version": "rustc 1.19.0 (0ade33941 2017-07-17) repack",
-    "size": 161014632,
-    "digest": "65bebcf94fc66ea618c58c9ac33f0f206095ecfe3931cc6edb301f4b40480e3b44b0f39aea7a25fed8eef47e63523e7e670082947a3662cdc04c68ebbe5dfc89",
+    "version": "rust-std 1.21.0-nightly (7ac979d8c 2017-08-16) repack",
+    "size": 171643628,
+    "digest": "cdb384bfba4ae75a4f23c0aeab3929f6585115825bd1fe2e7f705720d1df188966b1e33222607fe84aa3cd381ebd286bd521dbf682670b637cd9c8a771c048b5",
     "algorithm": "sha512",
     "filename": "rustc.tar.xz",
     "unpack": true
   }
 ]

--- a/browser/config/tooltool-manifests/linux64/hazard.manifest
+++ b/browser/config/tooltool-manifests/linux64/hazard.manifest
@@ -11,16 +11,16 @@
     "digest": "3915f8ec396c56a8a92e6f9695b70f09ce9d1582359d1258e37e3fd43a143bc974410e4cfc27f500e095f34a8956206e0ebf799b7287f0f38def0d5e34ed71c9",
     "unpack": true,
     "setup": "setup.sh",
     "algorithm": "sha512",
     "filename": "gtk3.tar.xz",
     "size": 12072532
   },
   {
-    "version": "rustc 1.19.0 (0ade33941 2017-07-17) repack",
-    "size": 161014632,
-    "digest": "65bebcf94fc66ea618c58c9ac33f0f206095ecfe3931cc6edb301f4b40480e3b44b0f39aea7a25fed8eef47e63523e7e670082947a3662cdc04c68ebbe5dfc89",
+    "version": "rust-std 1.21.0-nightly (7ac979d8c 2017-08-16) repack",
+    "size": 171643628,
+    "digest": "cdb384bfba4ae75a4f23c0aeab3929f6585115825bd1fe2e7f705720d1df188966b1e33222607fe84aa3cd381ebd286bd521dbf682670b637cd9c8a771c048b5",
     "algorithm": "sha512",
     "filename": "rustc.tar.xz",
     "unpack": true
   }
 ]

--- a/browser/config/tooltool-manifests/linux64/releng.manifest
+++ b/browser/config/tooltool-manifests/linux64/releng.manifest
@@ -3,16 +3,16 @@
     "size": 12072532,
     "digest": "3915f8ec396c56a8a92e6f9695b70f09ce9d1582359d1258e37e3fd43a143bc974410e4cfc27f500e095f34a8956206e0ebf799b7287f0f38def0d5e34ed71c9",
     "algorithm": "sha512",
     "filename": "gtk3.tar.xz",
     "setup": "setup.sh",
     "unpack": true
   },
   {
-    "version": "rustc 1.19.0 (0ade33941 2017-07-17) repack",
-    "size": 161014632,
-    "digest": "65bebcf94fc66ea618c58c9ac33f0f206095ecfe3931cc6edb301f4b40480e3b44b0f39aea7a25fed8eef47e63523e7e670082947a3662cdc04c68ebbe5dfc89",
+    "version": "rust-std 1.21.0-nightly (7ac979d8c 2017-08-16) repack",
+    "size": 171643628,
+    "digest": "cdb384bfba4ae75a4f23c0aeab3929f6585115825bd1fe2e7f705720d1df188966b1e33222607fe84aa3cd381ebd286bd521dbf682670b637cd9c8a771c048b5",
     "algorithm": "sha512",
     "filename": "rustc.tar.xz",
     "unpack": true
   }
 ]

--- a/browser/config/tooltool-manifests/macosx64/clang.manifest
+++ b/browser/config/tooltool-manifests/macosx64/clang.manifest
@@ -3,19 +3,19 @@
     "version": "clang 3.9.0",
     "size": 185632474,
     "digest": "0e1a556b65d6398fa812b9ceb5ce5e2dec3eda77d4a032a818182b34fc8ce602412f42388bb1fda6bea265d35c1dde3847a730b264fec01cd7e3dcfd39941660",
     "algorithm": "sha512",
     "filename": "clang.tar.bz2",
     "unpack": true
   },
   {
-    "version": "rustc 1.19.0 (0ade33941 2017-07-17) repack",
-    "size": 109162660,
-    "digest": "3335320fe950c75fd02c0828d062f633a0eadd77482c5c5f096d5faddc1826e500a557129ef89f5cdb0b5f1778b74bd0b569c996b9f54bdb105ef2bff7e628eb",
+    "version": "rust-std 1.21.0-nightly (7ac979d8c 2017-08-16) repack",
+    "size": 116507277,
+    "digest": "f5d8b1930e41eec3ed7897b1bbb4e735f7f7ba4c718c100aa24b10f07adcf2266fefd41faa5079411e24d0d6ab3a0289fa9d3f64bf5e43627b734a3e91ca2cfc",
     "algorithm": "sha512",
     "filename": "rustc.tar.bz2",
     "unpack": true
   },
   {
     "version": "sccache rev 69334a26ba65fc88e3934271a2ce6781c51b445e",
     "algorithm": "sha512",
     "visibility": "public",

--- a/browser/config/tooltool-manifests/macosx64/cross-releng.manifest
+++ b/browser/config/tooltool-manifests/macosx64/cross-releng.manifest
@@ -3,16 +3,16 @@
     "size": 35215976,
     "visibility": "internal",
     "digest": "8be736545ddab25ebded188458ce974d5c9a7e29f3c50d2ebfbcb878f6aff853dd2ff5a3528bdefc64396a10101a1b50fd2fe52000140df33643cebe1ea759da",
     "algorithm": "sha512",
     "unpack": true,
     "filename": "MacOSX10.7.sdk.tar.bz2"
   },
   {
-    "version": "rustc 1.19.0 (0ade33941 2017-07-17) repack",
-    "size": 155690216,
-    "digest": "379f542ea16c775e7bcad36823f0068ca6a1f17c2b25e42ef978d51865298ba4207dc89bbb614805f81a123d12e339209a447afbd12c1122e16f4c7c41e7d92b",
+    "version": "rust-std 1.21.0-nightly (7ac979d8c 2017-08-16) repack",
+    "size": 166044828,
+    "digest": "73ae57c7e06b4862e0a726811b850e07234c2f67152c25aa6fcc5b9181d7554bf44a132a9b033d21ac42322f1eb30db7b92c06b5eeb2ca69d9584b78ed32b1cc",
     "algorithm": "sha512",
     "filename": "rustc.tar.xz",
     "unpack": true
   }
 ]

--- a/browser/config/tooltool-manifests/macosx64/releng.manifest
+++ b/browser/config/tooltool-manifests/macosx64/releng.manifest
@@ -3,19 +3,19 @@
     "version": "clang 3.9.0",
     "size": 185632474,
     "digest": "0e1a556b65d6398fa812b9ceb5ce5e2dec3eda77d4a032a818182b34fc8ce602412f42388bb1fda6bea265d35c1dde3847a730b264fec01cd7e3dcfd39941660",
     "algorithm": "sha512",
     "filename": "clang.tar.bz2",
     "unpack": true
   },
   {
-    "version": "rustc 1.19.0 (0ade33941 2017-07-17) repack",
-    "size": 109162660,
-    "digest": "3335320fe950c75fd02c0828d062f633a0eadd77482c5c5f096d5faddc1826e500a557129ef89f5cdb0b5f1778b74bd0b569c996b9f54bdb105ef2bff7e628eb",
+    "version": "rust-std 1.21.0-nightly (7ac979d8c 2017-08-16) repack",
+    "size": 116507277,
+    "digest": "f5d8b1930e41eec3ed7897b1bbb4e735f7f7ba4c718c100aa24b10f07adcf2266fefd41faa5079411e24d0d6ab3a0289fa9d3f64bf5e43627b734a3e91ca2cfc",
     "algorithm": "sha512",
     "filename": "rustc.tar.bz2",
     "unpack": true
   },
   {
     "version": "cctools port from commit hash 8e9c3f2506b51",
     "size": 2233376,
     "digest": "d632ef587f0253f016aa5323999a3d9576284c04e66b5243a5780af9a55f474ac91ad8dee5bd86a6ee4e2593e2b345e2fd0aa4e8838b3686f84c5c5ac5c9c418",

--- a/browser/config/tooltool-manifests/win32/releng.manifest
+++ b/browser/config/tooltool-manifests/win32/releng.manifest
@@ -1,19 +1,19 @@
 [
   {
     "size": 266240,
     "digest": "bb345b0e700ffab4d09436981f14b5de84da55a3f18a7f09ebc4364a4488acdeab8d46f447b12ac70f2da1444a68b8ce8b8675f0dae2ccf845e966d1df0f0869",
     "algorithm": "sha512",
     "filename": "mozmake.exe"
   },
   {
-    "version": "rustc 1.19.0 (0ade33941 2017-07-17) repack",
-    "size": 97017057,
-    "digest": "b726645f9d26c5a3048720b3839166021c1cf91a02d2ff2f10c49adced7455c7352e18b5052084d80bf9d1c40ec1bf72d0397921b8cd23262f89fdbd10def58f",
+    "version": "rust-std 1.21.0-nightly (7ac979d8c 2017-08-16) repack",
+    "size": 101257548,
+    "digest": "b65b13a17626c734767241049c1af2fb6aa4af669b7c3e1ae975af1229f892016be03383857c8d4b0697f81e6d94c4339bbc4b019eaf7e48285da243d08afa1d",
     "algorithm": "sha512",
     "filename": "rustc.tar.bz2",
     "unpack": true
   },
   {
     "version": "Visual Studio 2015 Update 3 14.0.25425.01 / SDK 10.0.14393.0",
     "size": 326656969,
     "digest": "babc414ffc0457d27f5a1ed24a8e4873afbe2f1c1a4075469a27c005e1babc3b2a788f643f825efedff95b79686664c67ec4340ed535487168a3482e68559bc7",

--- a/browser/config/tooltool-manifests/win64/releng.manifest
+++ b/browser/config/tooltool-manifests/win64/releng.manifest
@@ -1,19 +1,19 @@
 [
   {
     "size": 266240,
     "digest": "bb345b0e700ffab4d09436981f14b5de84da55a3f18a7f09ebc4364a4488acdeab8d46f447b12ac70f2da1444a68b8ce8b8675f0dae2ccf845e966d1df0f0869",
     "algorithm": "sha512",
     "filename": "mozmake.exe"
   },
   {
-    "version": "rustc 1.19.0 (0ade33941 2017-07-17) repack",
-    "size": 103602526,
-    "digest": "558d2d18991ad8b250a5d6b46a55e1ffdffc50d6bdd9cb4b3a945dd3d1143836b32e47f1df612bfea97ca2c02333ed43055b6c3030ecb1632385fb6940c1d246",
+    "version": "rust-std 1.21.0-nightly (7ac979d8c 2017-08-16) repack",
+    "size": 109839362,
+    "digest": "1f427775e2f00deb4edbbb711990d5d4da88671aab88f9064f9ee0cda560c0064d18ef667c2146ed04f026f197b85fb46b5fbdbdc436f89c516d5989bc3e1986",
     "algorithm": "sha512",
     "visibility": "public",
     "filename": "rustc.tar.bz2",
     "unpack": true
   },
   {
     "version": "Visual Studio 2015 Update 3 14.0.25425.01 / SDK 10.0.14393.0",
     "size": 326656969,

--- a/mobile/android/config/tooltool-manifests/android-x86/releng.manifest
+++ b/mobile/android/config/tooltool-manifests/android-x86/releng.manifest
@@ -19,19 +19,19 @@
   {
     "size": 4906080,
     "digest": "d735544e039da89382c53b2302b7408d4610247b4f8b5cdc5a4d5a8ec5470947b19e8ea7f7a37e78222e661347e394e0030d81f41534138b527b14e9c4e55634",
     "algorithm": "sha512",
     "filename": "jsshell.tar.xz",
     "unpack": true
   },
   {
-    "version": "rustc 1.19.0 (0ade33941 2017-07-17) repack",
-    "size": 151322128,
-    "digest": "1d6d6e8bbf7535a4f1c8f1292562e30c868bfd3ac323992fc287be09f7fa3167c2f9e01dc98143967983e30488fe3ecaebff530ba4ec9113033d60af936c4f4d",
+    "version": "rust-std 1.21.0-nightly (7ac979d8c 2017-08-16) repack",
+    "size": 162146968,
+    "digest": "1e7bb5ac79a2945ffb4a3a1195c89cf541089959edd88f2ef0993ec3f38af2be286c36a92957d7b2dcd3f6410b1171796b0e09f1ead4c5225e0ddf85647a55e8",
     "algorithm": "sha512",
     "filename": "rustc.tar.xz",
     "unpack": true
   },
   {
     "size": 7797928,
     "visibility": "public",
     "digest": "7bb5c7b3586179a7805ae60b025b7856cb8dbed66da1b7962bc446d94ea6fa45ed55ebfe065d2d82690c68bf71bdab613e97f53da79b85e3185955461f751256",

--- a/mobile/android/config/tooltool-manifests/android/releng.manifest
+++ b/mobile/android/config/tooltool-manifests/android/releng.manifest
@@ -52,19 +52,19 @@
     "algorithm": "sha512",
     "visibility": "public",
     "filename": "gradle-dist.tar.xz",
     "unpack": true,
     "digest": "e3cfe7f8259ad97722243d4e873d5a05c014bfc24d637427f89d804bf5073290229c778ea303142cf06c2dc79e0492f23521f57d3a73825f55b8db587317646f",
     "size": 51753660
   },
   {
-    "version": "rustc 1.19.0 (0ade33941 2017-07-17) repack",
-    "size": 151322128,
-    "digest": "1d6d6e8bbf7535a4f1c8f1292562e30c868bfd3ac323992fc287be09f7fa3167c2f9e01dc98143967983e30488fe3ecaebff530ba4ec9113033d60af936c4f4d",
+    "version": "rust-std 1.21.0-nightly (7ac979d8c 2017-08-16) repack",
+    "size": 162146968,
+    "digest": "1e7bb5ac79a2945ffb4a3a1195c89cf541089959edd88f2ef0993ec3f38af2be286c36a92957d7b2dcd3f6410b1171796b0e09f1ead4c5225e0ddf85647a55e8",
     "algorithm": "sha512",
     "filename": "rustc.tar.xz",
     "unpack": true
   },
   {
     "algorithm": "sha512",
     "visibility": "public",
     "filename": "dotgradle.tar.xz",