I had the same problem after upgrade to Chrome 73. Thanks to @wOxxOm
This is the workaround until now:
- Go to chrome://flags
- Disabled the Enable network service
UPDATE:
This is not a bug, according to this announcement: https://www.chromium.org/Home/chromium-security/extension-content-script-fetches
You will need to put the Cross-Origin Fetches to the background script instead of the content script.