diff --git a/lighthouse-cli/bin.js b/lighthouse-cli/bin.js
index 36611d124be2..d2542fb6d338 100644
--- a/lighthouse-cli/bin.js
+++ b/lighthouse-cli/bin.js
@@ -17,6 +17,8 @@ const log = require('lighthouse-logger');
 // @ts-ignore
 const perfOnlyConfig = require('../lighthouse-core/config/perf.json');
 // @ts-ignore
+const mixedContentConfig = require('../lighthouse-core/config/mixed-content.js');
+// @ts-ignore
 const pkg = require('../package.json');
 const Sentry = require('../lighthouse-core/lib/sentry');
 
@@ -56,6 +58,10 @@ if (cliFlags.configPath) {
   config = /** @type {!LH.Config} */ (require(cliFlags.configPath));
 } else if (cliFlags.perf) {
   config = /** @type {!LH.Config} */ (perfOnlyConfig);
+} else if (cliFlags.mixedContent) {
+  config = /** @type {!LH.Config} */ (mixedContentConfig);
+  // The mixed-content audits require headless Chrome (https://crbug.com/764505).
+  cliFlags.chromeFlags = `${cliFlags.chromeFlags} --headless`;
 }
 
 // set logging preferences
diff --git a/lighthouse-cli/cli-flags.js b/lighthouse-cli/cli-flags.js
index e17dcd4452e3..be79b17bad86 100644
--- a/lighthouse-cli/cli-flags.js
+++ b/lighthouse-cli/cli-flags.js
@@ -58,9 +58,9 @@ function getFlags(manualArgv) {
 
       .group(
         [
-          'save-assets', 'list-all-audits', 'list-trace-categories',
-          'additional-trace-categories', 'config-path', 'chrome-flags', 'perf', 'port',
-          'hostname', 'max-wait-for-load', 'enable-error-reporting', 'gather-mode', 'audit-mode',
+          'save-assets', 'list-all-audits', 'list-trace-categories', 'additional-trace-categories',
+          'config-path', 'chrome-flags', 'perf', 'mixed-content', 'port', 'hostname',
+          'max-wait-for-load', 'enable-error-reporting', 'gather-mode', 'audit-mode',
         ],
         'Configuration:')
       .describe({
@@ -81,6 +81,7 @@ function getFlags(manualArgv) {
         'additional-trace-categories':
             'Additional categories to capture with the trace (comma-delimited).',
         'config-path': 'The path to the config JSON.',
+        'mixed-content': 'Use the mixed-content auditing configuration.',
         'chrome-flags':
             `Custom flags to pass to Chrome (space-delimited). For a full list of flags, see http://bit.ly/chrome-flags
             Additionally, use the CHROME_PATH environment variable to use a specific Chrome binary. Requires Chromium version 54.0 or later. If omitted, any detected Chrome Canary or Chrome stable will be used.`,
@@ -110,7 +111,7 @@ function getFlags(manualArgv) {
         'disable-storage-reset', 'disable-device-emulation', 'disable-cpu-throttling',
         'disable-network-throttling', 'save-assets', 'list-all-audits',
         'list-trace-categories', 'perf', 'view', 'verbose', 'quiet', 'help',
-        'gather-mode', 'audit-mode',
+        'gather-mode', 'audit-mode', 'mixed-content',
       ])
       .choices('output', printer.getValidOutputOptions())
       // force as an array
diff --git a/lighthouse-cli/run.js b/lighthouse-cli/run.js
index 3c965675fc96..abd70966138c 100644
--- a/lighthouse-cli/run.js
+++ b/lighthouse-cli/run.js
@@ -30,7 +30,7 @@ const _PROTOCOL_TIMEOUT_EXIT_CODE = 67;
  */
 function parseChromeFlags(flags = '') {
   const parsed = yargsParser(
-      flags, {configuration: {'camel-case-expansion': false, 'boolean-negation': false}});
+      flags.trim(), {configuration: {'camel-case-expansion': false, 'boolean-negation': false}});
 
   return Object
       .keys(parsed)
diff --git a/lighthouse-core/index.js b/lighthouse-core/index.js
index dc0a85284a2e..b832fe7671cb 100644
--- a/lighthouse-core/index.js
+++ b/lighthouse-core/index.js
@@ -41,7 +41,6 @@ function lighthouse(url, flags = {}, configJSON) {
 
     // Use ConfigParser to generate a valid config file
     const config = new Config(configJSON, flags.configPath);
-
     const connection = new ChromeProtocol(flags.port, flags.hostname);
 
     // kick off a lighthouse run
diff --git a/typings/externs.d.ts b/typings/externs.d.ts
index 407254da23fd..90a8ee3ffe10 100644
--- a/typings/externs.d.ts
+++ b/typings/externs.d.ts
@@ -26,6 +26,7 @@ export interface Flags {
   gatherMode: boolean;
   configPath?: string;
   perf: boolean;
+  mixedContent: boolean;
   verbose: boolean;
   quiet: boolean;
 }