Security error in Firefox WebExtension when trying getUrl image

Add-ons Development
#1

Trying to port some Chrome extension and getting this _Security Error: Content at “http://example.com” may not load or link to "moz-extension://04d69802-c26f-47ae-86f2-d54650455e5a/blocks/indicators/_icon/indicators__icon-tweet.png"

(function () {
  'use strict';
   var PATHS = {
    TWITTER: chrome.extension.getURL("blocks/indicators/__icon/indicators__icon-tweet.png")
   };
})();

In manifest.json this path is in web_accessible_resources.

#2

Have you tried loading the moz-extension: URL in the location bar to verify the image is there?

#3

Yeah, image is accessible via url.
I’ve used ** asterisks in paths, to provide paths to all elements.
Instead, It should be full path for every script/style/image whatever.

#4

It could be the CSP restrictions on the site don’t allow loading this type of content. There is an open bug for it.