Currently it's extremely difficult to know a current page's CSP value, so it's very difficult to debug problems. This value should be shown somewhere, and preferably in the "Page Information" modal that already has a Security tab with security-related information.
This is currently available in the GCLI with the command "security csp". Open the "Developer Toolbar" to get there. On the down side the devtools team is talking about removing the GCLI feature (it's not used much). We've talked about other places to move this information in devtools. It's much more likely to find a home in DevTools than in Page Information given the different audiences for each. Although not exactly what you requested in the bug, I think the intent of the bug is satisfied so I'm going to close it.
Status: NEW → RESOLVED
Closed: Last year
Resolution: --- → WORKSFORME
Hey Daniel, Thanks, the information that this even exists is very well hidden... I'll look into adding the link to  in some others CSP pages on MDN. I agree that this is more a developer thing, so would be better located in devtools. For those following along,  holds a discussion about our plans to display this better in the devtools.  https://developer.mozilla.org/en-US/docs/Tools/GCLI/Display_security_and_privacy_policies  https://mail.mozilla.org/pipermail/firefox-dev/2018-March/006296.html
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