Add Content-Security-Policy for options page

Author: Brawl345

public/manifest.json

@@ -4,7 +4,7 @@
   "name": "__MSG_extensionName__",
   "description": "__MSG_extensionDescription__",
   "author": "Andreas Bielawski",
-  "version": "4.1.0",
+  "version": "4.1.1",
   "icons": {
     "16": "icons/16.png",
     "32": "icons/32.png",
@@ -21,5 +21,8 @@
     "open_in_tab": true,
     "page": "options/options.html"
   },
+  "content_security_policy": {
+    "extension_pages": "default-src 'none'; script-src 'self'; style-src 'self' 'unsafe-inline'; img-src 'self' data:"
+  },
   "permissions": ["contextMenus", "storage"]
 }