diff --git a/package-lock.json b/package-lock.json
index 045bfcf5..2ddde372 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -182,6 +182,12 @@
       "integrity": "sha512-rr+OQyAjxze7GgWrSaJwydHStIhHq2lvY3BOC2Mj7KnzI7XK0Uw1TOOdI9lDoajEbSWLiYgoo4f1R51erQfhPQ==",
       "dev": true
     },
+    "@types/dedent": {
+      "version": "0.7.0",
+      "resolved": "https://registry.npmjs.org/@types/dedent/-/dedent-0.7.0.tgz",
+      "integrity": "sha512-EGlKlgMhnLt/cM4DbUSafFdrkeJoC9Mvnj0PUCU7tFmTjMjNRT957kXCx0wYm3JuEq4o4ZsS5vG+NlkM2DMd2A==",
+      "dev": true
+    },
     "@types/estree": {
       "version": "0.0.39",
       "resolved": "https://registry.npmjs.org/@types/estree/-/estree-0.0.39.tgz",
diff --git a/package.json b/package.json
index fa813be0..44bc7fac 100644
--- a/package.json
+++ b/package.json
@@ -15,9 +15,11 @@
     "@rollup/plugin-node-resolve": "^9.0.0",
     "@rollup/plugin-replace": "^2.3.4",
     "@surma/rollup-plugin-off-main-thread": "^1.4.2",
+    "@types/dedent": "^0.7.0",
     "@types/node": "^14.14.7",
     "comlink": "^4.3.0",
     "cssnano": "^4.1.10",
+    "dedent": "^0.7.0",
     "del": "^5.1.0",
     "file-drop-element": "^1.0.1",
     "husky": "^4.3.0",
diff --git a/src/copy/_headers b/src/copy/_headers
deleted file mode 100644
index ecdb8a68..00000000
--- a/src/copy/_headers
+++ /dev/null
@@ -1,14 +0,0 @@
-/*
-  Cache-Control: no-cache
-
-/c/*
-  Cache-Control: max-age=31536000
-
-# COOP+COEP for WebAssembly threads.
-/*
-  Cross-Origin-Embedder-Policy: require-corp
-  Cross-Origin-Opener-Policy: same-origin
-# Origin trial for WebAssembly SIMD.
-# ATTENTION: This one is configured for dev--squoosh.netlify.app preview.
-# For production squoosh.app, replace with AgoKiDqjr0GVPtrwV/vuVlrrSvbDa5Yb99s+q66ly816DrrAQ8Cdas33NgDtmhxM4BtDP9PEdyuxHPyTQHD5ZAcAAABUeyJvcmlnaW4iOiJodHRwczovL3NxdW9vc2guYXBwOjQ0MyIsImZlYXR1cmUiOiJXZWJBc3NlbWJseVNpbWQiLCJleHBpcnkiOjE2MDg2NzI5OTR9.
-  Origin-Trial: As3b1fXjclhF8ZgvUkIqOo3r1/Jqvx0mNuT6Ilgb7SdpeJnV8lUdYr7i+OKgCmcVTWkqjkF23LJ+xZ111VYMEQIAAABheyJvcmlnaW4iOiJodHRwczovL2Rldi0tc3F1b29zaC5uZXRsaWZ5LmFwcDo0NDMiLCJmZWF0dXJlIjoiV2ViQXNzZW1ibHlTaW1kIiwiZXhwaXJ5IjoxNjA5NDI4Nzk4fQ==
diff --git a/src/copy/_redirects b/src/copy/_redirects
index 66fd124c..31e2bf01 100644
--- a/src/copy/_redirects
+++ b/src/copy/_redirects
@@ -1,2 +1 @@
-/index.html / 301
-/* /index.html 301
\ No newline at end of file
+/editor / 301
diff --git a/src/static-build/index.tsx b/src/static-build/index.tsx
index 4d104375..d90f4cf0 100644
--- a/src/static-build/index.tsx
+++ b/src/static-build/index.tsx
@@ -16,6 +16,23 @@ import { renderPage, writeFiles } from './utils';
 import IndexPage from './pages/index';
 import iconLargeMaskable from 'url:static-build/assets/icon-large-maskable.png';
 import iconLarge from 'url:static-build/assets/icon-large.png';
+import dedent from 'dedent';
+
+// Set by Netlify
+const branch = process.env.BRANCH;
+
+const branchOriginTrialIds = new Map([
+  [
+    'dev',
+    'As3b1fXjclhF8ZgvUkIqOo3r1/Jqvx0mNuT6Ilgb7SdpeJnV8lUdYr7i+OKgCmcVTWkqjkF23LJ+xZ111VYMEQIAAABheyJvcmlnaW4iOiJodHRwczovL2Rldi0tc3F1b29zaC5uZXRsaWZ5LmFwcDo0NDMiLCJmZWF0dXJlIjoiV2ViQXNzZW1ibHlTaW1kIiwiZXhwaXJ5IjoxNjA5NDI4Nzk4fQ==',
+  ],
+  [
+    'live',
+    'AgoKiDqjr0GVPtrwV/vuVlrrSvbDa5Yb99s+q66ly816DrrAQ8Cdas33NgDtmhxM4BtDP9PEdyuxHPyTQHD5ZAcAAABUeyJvcmlnaW4iOiJodHRwczovL3NxdW9vc2guYXBwOjQ0MyIsImZlYXR1cmUiOiJXZWJBc3NlbWJseVNpbWQiLCJleHBpcnkiOjE2MDg2NzI5OTR9',
+  ],
+]);
+
+const originTrialId = branchOriginTrialIds.get(branch || '');
 
 interface Output {
   [outputPath: string]: string;
@@ -57,6 +74,27 @@ const toOutput: Output = {
       },
     },
   }),
+  _headers: dedent`
+    /*
+      Cache-Control: no-cache
+
+    /c/*
+      Cache-Control: max-age=31536000
+
+    # COOP+COEP for WebAssembly threads.
+    /*
+      Cross-Origin-Embedder-Policy: require-corp
+      Cross-Origin-Opener-Policy: same-origin
+
+    # Origin trial for WebAssembly SIMD.
+    ${
+      originTrialId
+        ? `  Origin-Trial: ${originTrialId}`
+        : `# Cannot find origin trial ID. process.env.BRANCH is: ${JSON.stringify(
+            branch,
+          )}`
+    }
+  `,
 };
 
 writeFiles(toOutput);