diff --git a/experimental/puppeteer-firefox/lib/DOMWorld.js b/experimental/puppeteer-firefox/lib/DOMWorld.js
index 096c06f2b8e..8d50da02370 100644
--- a/experimental/puppeteer-firefox/lib/DOMWorld.js
+++ b/experimental/puppeteer-firefox/lib/DOMWorld.js
@@ -132,11 +132,11 @@ class DOMWorld {
    * @param {string} html
    */
   async setContent(html) {
-    await this.evaluate(html => {
+    await this.evaluate(base64html => {
       document.open();
-      document.write(html);
+      document.write(atob(base64html));
       document.close();
-    }, html);
+    }, Buffer.from(html).toString('base64'));
   }
 
   /**
diff --git a/lib/DOMWorld.js b/lib/DOMWorld.js
index 1668fad0034..503df690a9c 100644
--- a/lib/DOMWorld.js
+++ b/lib/DOMWorld.js
@@ -203,11 +203,11 @@ class DOMWorld {
     } = options;
     // We rely upon the fact that document.open() will reset frame lifecycle with "init"
     // lifecycle event. @see https://crrev.com/608658
-    await this.evaluate(html => {
+    await this.evaluate(base64html => {
       document.open();
-      document.write(html);
+      document.write(atob(base64html));
       document.close();
-    }, html);
+    }, Buffer.from(html).toString('base64'));
     const watcher = new LifecycleWatcher(this._frameManager, this._frame, waitUntil, timeout);
     const error = await Promise.race([
       watcher.timeoutOrTerminationPromise(),
diff --git a/test/page.spec.js b/test/page.spec.js
index 1560a416358..4b4290d3fce 100644
--- a/test/page.spec.js
+++ b/test/page.spec.js
@@ -749,6 +749,10 @@ module.exports.addTests = function({testRunner, expect, headless, puppeteer, CHR
       for (let i = 0; i < 20; ++i)
         await page.setContent('<div>yo</div>');
     });
+    it('should work with tricky content', async({page, server}) => {
+      await page.setContent('<div>hello world</div>' + '\x7F');
+      expect(await page.$eval('div', div => div.textContent)).toBe('hello world');
+    });
   });
 
   describe_fails_ffox('Page.setBypassCSP', function() {