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I tried everything you’ve said to try, including turning off ‘Net Check’.

When I click on my Chrome app, it opens, but 2 – 3 seconds later it self-closes without anything else happening. It has been known to cause problems with some applications. It’s a layer of protection that McAfee provides where it monitors the connection and validates it against trusted IP address info. You’re set! The application should now be allowed to access the network through the firewall. If you have problems with the application after setting all the items above, you may want to set “ Net Guard” to “ Off“. This setting can block some traffic on certain apps. Otherwise, you can select “ Open ports to Home and Work networks“, or “ Open to all devices“. For the drop-down menu “ Use designated ports” should be sufficient to work with most apps.Otherwise select “ Outgoing Only” to allow only outbound traffic. In the “ Access” section, select “ Incoming and outgoing” to allow both incoming and outgoing traffic to the applications.If the program is not listed, select the “ Add” button, then select “ Browse” to choose the application. Choose the program you wish to allow access, then select “ Edit“.Select the “ Internet Connections for Programs” option.Right-click the McAfee logo in the Windows Taskbar down the the time, then select “ Change Settings” > “ Firewall“.The example below should be everything you need to allow you to inject a js that sends messages from any page on to your own extensionįirst in the manifest.The tutorial is based on version 13.6 of McAfee Internet Security. and a rule in the manifest to link everything together.injecting extension id for the message sender.Some of the other answers here have good debugging advice or small pieces of the puzzle, however if you want to inject into (3rd party) web pages like me, then no answers here listed the correct components.