diff --git a/codecs/imagequant/Makefile b/codecs/imagequant/Makefile
index b75f6353..1b56ab76 100644
--- a/codecs/imagequant/Makefile
+++ b/codecs/imagequant/Makefile
@@ -1,3 +1,4 @@
+CODEC_URL := https://github.com/ImageOptim/libimagequant/archive/2.12.1.tar.gz
 CODEC_DIR := node_modules/libimagequant
 CODEC_OUT_RELATIVE := libimagequant.a
 CODEC_OUT := $(addprefix $(CODEC_DIR)/, $(CODEC_OUT_RELATIVE))
@@ -28,6 +29,12 @@ $(CODEC_DIR)/config.mk: $(CODEC_DIR)/configure
 	cd $(CODEC_DIR) && ./configure \
 		--disable-sse
 
+$(CODEC_DIR)/configure: $(CODEC_DIR)
+
+$(CODEC_DIR):
+	mkdir -p $@
+	curl -sL $(CODEC_URL) | tar xz --strip 1 -C $@
+
 clean:
 	$(RM) $(OUT_JS) $(OUT_WASM)
 	$(MAKE) -C $(CODEC_DIR) clean
diff --git a/codecs/imagequant/package-lock.json b/codecs/imagequant/package-lock.json
index b710f04f..1656f50a 100644
--- a/codecs/imagequant/package-lock.json
+++ b/codecs/imagequant/package-lock.json
@@ -1,1147 +1,4 @@
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-      "integrity": "sha1-pcbVMr5lbiPbgg77lDofBJmNY68=",
-      "dev": true
-    },
-    "yauzl": {
-      "version": "2.9.1",
-      "resolved": "https://registry.npmjs.org/yauzl/-/yauzl-2.9.1.tgz",
-      "integrity": "sha1-qBmB6nCleUYTOIPwKcWCGok1mn8=",
-      "dev": true,
-      "requires": {
-        "buffer-crc32": "~0.2.3",
-        "fd-slicer": "~1.0.1"
-      }
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-  }
+  "lockfileVersion": 1
 }
diff --git a/codecs/imagequant/package.json b/codecs/imagequant/package.json
index ad9bf993..e998c127 100644
--- a/codecs/imagequant/package.json
+++ b/codecs/imagequant/package.json
@@ -1,13 +1,6 @@
 {
   "name": "imagequant",
   "scripts": {
-    "install": "napa",
     "build": "../build-cpp.sh"
-  },
-  "napa": {
-    "libimagequant": "ImageOptim/libimagequant#2.12.1"
-  },
-  "devDependencies": {
-    "napa": "3.0.0"
   }
 }
diff --git a/codecs/mozjpeg_enc/Makefile b/codecs/mozjpeg_enc/Makefile
index bdd3b872..30b5ca0e 100644
--- a/codecs/mozjpeg_enc/Makefile
+++ b/codecs/mozjpeg_enc/Makefile
@@ -1,3 +1,4 @@
+CODEC_URL := https://github.com/mozilla/mozjpeg/archive/v3.3.1.tar.gz
 CODEC_DIR := node_modules/mozjpeg
 CODEC_OUT_RELATIVE := .libs/libjpeg.a rdswitch.o
 CODEC_OUT := $(addprefix $(CODEC_DIR)/, $(CODEC_OUT_RELATIVE))
@@ -37,9 +38,15 @@ $(CODEC_DIR)/Makefile: $(CODEC_DIR)/configure
 		--without-arith-enc \
 		--without-arith-dec
 
-$(CODEC_DIR)/configure:
+$(CODEC_DIR)/configure: $(CODEC_DIR)/configure.ac
 	cd $(CODEC_DIR) && autoreconf -iv
 
+$(CODEC_DIR)/configure.ac: $(CODEC_DIR)
+
+$(CODEC_DIR):
+	mkdir -p $@
+	curl -sL $(CODEC_URL) | tar xz --strip 1 -C $@
+
 clean:
 	$(RM) $(OUT_JS) $(OUT_WASM)
 	$(MAKE) -C $(CODEC_DIR) clean
diff --git a/codecs/mozjpeg_enc/package-lock.json b/codecs/mozjpeg_enc/package-lock.json
index da66a524..a6f8fa4f 100644
--- a/codecs/mozjpeg_enc/package-lock.json
+++ b/codecs/mozjpeg_enc/package-lock.json
@@ -1,1147 +1,4 @@
 {
   "name": "mozjpeg_enc",
-  "requires": true,
-  "lockfileVersion": 1,
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-      "dev": true
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-      "resolved": "https://registry.npmjs.org/are-we-there-yet/-/are-we-there-yet-1.1.4.tgz",
-      "integrity": "sha1-u13KOCu5TwXhUZQ3PRb9O6HKEQ0=",
-      "dev": true,
-      "requires": {
-        "delegates": "^1.0.0",
-        "readable-stream": "^2.0.6"
-      }
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-    "balanced-match": {
-      "version": "1.0.0",
-      "resolved": "https://registry.npmjs.org/balanced-match/-/balanced-match-1.0.0.tgz",
-      "integrity": "sha1-ibTRmasr7kneFk6gK4nORi1xt2c=",
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 }
diff --git a/codecs/mozjpeg_enc/package.json b/codecs/mozjpeg_enc/package.json
index 34dfd4b7..7b011998 100644
--- a/codecs/mozjpeg_enc/package.json
+++ b/codecs/mozjpeg_enc/package.json
@@ -1,13 +1,6 @@
 {
   "name": "mozjpeg_enc",
   "scripts": {
-    "install": "napa",
     "build": "../build-cpp.sh"
-  },
-  "napa": {
-    "mozjpeg": "mozilla/mozjpeg#v3.3.1"
-  },
-  "devDependencies": {
-    "napa": "3.0.0"
   }
 }
diff --git a/codecs/webp/Makefile b/codecs/webp/Makefile
index 00fcbd2f..1b871179 100644
--- a/codecs/webp/Makefile
+++ b/codecs/webp/Makefile
@@ -1,3 +1,4 @@
+CODEC_URL := https://storage.googleapis.com/downloads.webmproject.org/releases/webp/libwebp-1.0.2.tar.gz
 CODEC_DIR = node_modules/libwebp
 CODEC_OUT_RELATIVE = src/.libs/libwebp.a
 CODEC_OUT := $(addprefix $(CODEC_DIR)/, $(CODEC_OUT_RELATIVE))
@@ -41,9 +42,15 @@ $(CODEC_DIR)/src/Makefile: $(CODEC_DIR)/configure
 		--disable-sse2 \
 		--disable-sse4.1
 
-$(CODEC_DIR)/configure:
+$(CODEC_DIR)/configure: $(CODEC_DIR)/configure.ac
 	cd $(CODEC_DIR) && autoreconf -iv
 
+$(CODEC_DIR)/configure.ac: $(CODEC_DIR)
+
+$(CODEC_DIR):
+	mkdir -p $@
+	curl -sL $(CODEC_URL) | tar xz --strip 1 -C $@
+
 clean:
 	$(RM) $(OUT_JS) $(OUT_WASM)
 	$(MAKE) -C $(CODEC_DIR) clean
diff --git a/codecs/webp/package-lock.json b/codecs/webp/package-lock.json
index 1e8652cf..e947884c 100644
--- a/codecs/webp/package-lock.json
+++ b/codecs/webp/package-lock.json
@@ -1,1147 +1,4 @@
 {
   "name": "webp",
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-      "dev": true
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-      "integrity": "sha1-u13KOCu5TwXhUZQ3PRb9O6HKEQ0=",
-      "dev": true,
-      "requires": {
-        "delegates": "^1.0.0",
-        "readable-stream": "^2.0.6"
-      }
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-      "integrity": "sha1-ibTRmasr7kneFk6gK4nORi1xt2c=",
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-      "integrity": "sha1-8y6srFoXW+ol1/q1Zas+2HQe9W8=",
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-        "write-file-atomic": "^2.0.0"
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-          "version": "2.0.0",
-          "resolved": "https://registry.npmjs.org/sort-keys/-/sort-keys-2.0.0.tgz",
-          "integrity": "sha1-ZYU1WEhh7JfXMNbPQYIuH1ZoQSg=",
-          "dev": true,
-          "requires": {
-            "is-plain-obj": "^1.0.0"
-          }
-        }
-      }
-    },
-    "xtend": {
-      "version": "4.0.1",
-      "resolved": "https://registry.npmjs.org/xtend/-/xtend-4.0.1.tgz",
-      "integrity": "sha1-pcbVMr5lbiPbgg77lDofBJmNY68=",
-      "dev": true
-    },
-    "yauzl": {
-      "version": "2.9.1",
-      "resolved": "https://registry.npmjs.org/yauzl/-/yauzl-2.9.1.tgz",
-      "integrity": "sha1-qBmB6nCleUYTOIPwKcWCGok1mn8=",
-      "dev": true,
-      "requires": {
-        "buffer-crc32": "~0.2.3",
-        "fd-slicer": "~1.0.1"
-      }
-    }
-  }
+  "lockfileVersion": 1
 }
diff --git a/codecs/webp/package.json b/codecs/webp/package.json
index 926fbca5..47297d95 100644
--- a/codecs/webp/package.json
+++ b/codecs/webp/package.json
@@ -1,13 +1,6 @@
 {
   "name": "webp",
   "scripts": {
-    "install": "napa",
     "build": "../build-cpp.sh"
-  },
-  "napa": {
-    "libwebp": "webmproject/libwebp#v1.0.2"
-  },
-  "devDependencies": {
-    "napa": "3.0.0"
   }
 }
diff --git a/src/codecs/decoders.ts b/src/codecs/decoders.ts
index 8347bcf2..b23f3791 100644
--- a/src/codecs/decoders.ts
+++ b/src/codecs/decoders.ts
@@ -1,19 +1,19 @@
-import { nativeDecode, sniffMimeType, canDecodeImage } from '../lib/util';
+import { builtinDecode, sniffMimeType, canDecodeImage } from '../lib/util';
 import Processor from './processor';
 import webpDataUrl from 'url-loader!./tiny.webp';
 
-const nativeWebPSupported = canDecodeImage(webpDataUrl);
+const webPSupported = canDecodeImage(webpDataUrl);
 
 export async function decodeImage(blob: Blob, processor: Processor): Promise<ImageData> {
   const mimeType = await sniffMimeType(blob);
 
   try {
-    if (mimeType === 'image/webp' && !(await nativeWebPSupported)) {
+    if (mimeType === 'image/webp' && !(await webPSupported)) {
       return await processor.webpDecode(blob);
     }
 
     // Otherwise, just throw it at the browser's decoder.
-    return await nativeDecode(blob);
+    return await builtinDecode(blob);
   } catch (err) {
     throw Error("Couldn't decode image");
   }
diff --git a/src/codecs/resize/processor-sync.ts b/src/codecs/resize/processor-sync.ts
index f2192185..22b5e85b 100644
--- a/src/codecs/resize/processor-sync.ts
+++ b/src/codecs/resize/processor-sync.ts
@@ -1,4 +1,4 @@
-import { nativeResize, NativeResizeMethod, drawableToImageData } from '../../lib/util';
+import { builtinResize, BuiltinResizeMethod, drawableToImageData } from '../../lib/util';
 import { BrowserResizeOptions, VectorResizeOptions } from './processor-meta';
 import { getContainOffsets } from './util';
 
@@ -12,9 +12,9 @@ export function browserResize(data: ImageData, opts: BrowserResizeOptions): Imag
     ({ sx, sy, sw, sh } = getContainOffsets(sw, sh, opts.width, opts.height));
   }
 
-  return nativeResize(
+  return builtinResize(
     data, sx, sy, sw, sh, opts.width, opts.height,
-    opts.method.slice('browser-'.length) as NativeResizeMethod,
+    opts.method.slice('browser-'.length) as BuiltinResizeMethod,
   );
 }
 
diff --git a/src/components/select/index.tsx b/src/components/select/index.tsx
index cbaf4541..d9cc9abc 100644
--- a/src/components/select/index.tsx
+++ b/src/components/select/index.tsx
@@ -12,8 +12,8 @@ export default class Select extends Component<Props, State> {
 
     return (
       <div class={style.select}>
-        <select class={`${style.nativeSelect} ${large ? style.large : ''}`} {...otherProps}/>
-        <svg class={style.arrow} viewBox="0 0 10 5"><path d="M0 0l5 5 5-5z"/></svg>
+        <select class={`${style.builtinSelect} ${large ? style.large : ''}`} {...otherProps} />
+        <svg class={style.arrow} viewBox="0 0 10 5"><path d="M0 0l5 5 5-5z" /></svg>
       </div>
     );
   }
diff --git a/src/components/select/style.scss b/src/components/select/style.scss
index b13ea914..82f21a02 100644
--- a/src/components/select/style.scss
+++ b/src/components/select/style.scss
@@ -2,7 +2,7 @@
   position: relative;
 }
 
-.native-select {
+.builtin-select {
   background: #2f2f2f;
   border-radius: 4px;
   font: inherit;
diff --git a/src/lib/util.ts b/src/lib/util.ts
index 538626c8..d0f9828f 100644
--- a/src/lib/util.ts
+++ b/src/lib/util.ts
@@ -163,7 +163,7 @@ export function drawableToImageData(
   return ctx.getImageData(0, 0, width, height);
 }
 
-export async function nativeDecode(blob: Blob): Promise<ImageData> {
+export async function builtinDecode(blob: Blob): Promise<ImageData> {
   // Prefer createImageBitmap as it's the off-thread option for Firefox.
   const drawable = 'createImageBitmap' in self ?
     await createImageBitmap(blob) : await blobToImg(blob);
@@ -171,13 +171,13 @@ export async function nativeDecode(blob: Blob): Promise<ImageData> {
   return drawableToImageData(drawable);
 }
 
-export type NativeResizeMethod = 'pixelated' | 'low' | 'medium' | 'high';
+export type BuiltinResizeMethod = 'pixelated' | 'low' | 'medium' | 'high';
 
-export function nativeResize(
+export function builtinResize(
   data: ImageData,
   sx: number, sy: number, sw: number, sh: number,
   dw: number, dh: number,
-  method: NativeResizeMethod,
+  method: BuiltinResizeMethod,
 ): ImageData {
   const canvasSource = document.createElement('canvas');
   canvasSource.width = data.width;
diff --git a/src/sw/util.ts b/src/sw/util.ts
index cb7156b3..8faa1020 100644
--- a/src/sw/util.ts
+++ b/src/sw/util.ts
@@ -116,7 +116,7 @@ export async function cacheAdditionalProcessors(cacheName: string, buildAssets:
     return createImageBitmap(blob).then(() => true, () => false);
   })();
 
-  // No point caching the WebP decoder if it's supported natively:
+  // No point caching the WebP decoder if the browser supports it:
   if (supportsWebP) {
     toCache = toCache.filter(asset => !/webp[\-_]dec/.test(asset));
   }