How to get Chrome to allow mixed content?

Steps as of Chrome v91 (6/17/2021):

1. Click the Not secure warning next to the URL

2. Click Site settings on the popup box

3. Near the bottom of the list is Insecure content, change this to Allow

4. Close settings, go back to the site, and Refresh the page

Older Chrome Versions:

timmmy_42 answers this on: https://productforums.google.com/forum/#!topic/chrome/OrwppKWbKnc

In the address bar at the right end should be a 'shield' icon, you can click on that to run insecure content.

This worked for me in Chromium-dev Version 36.0.1933.0 (262849).

In Windows open the Run window (Win + R):

C:\Program Files (x86)\Google\Chrome\Application\chrome.exe  --allow-running-insecure-content

In OS-X Terminal.app run the following command ⌘+space:

open /Applications/Google\ Chrome.app --args --allow-running-insecure-content

Note: You seem to be able to add the argument --allow-running-insecure-content to bypass this for development. But its not a recommended solution.