Better warnings for firefox CSP

src/main.ts

@@ -659,6 +659,17 @@ const startup = async (is4chanX = true) => {
     if (init)
         return;
     init = true;
+    
+    window.addEventListener("securitypolicyviolation", (e) => {
+        if (e.blockedURI.startsWith("blob")) {
+            if (supportedMainDomain(location.host)) {
+                fireNotification("error", "CSP is preventing PEE from running, add blob: to the allowed JS whitelist in 4chanX in Advanced Settings");
+            } else if (supportedAltDomain(location.host)) {
+                fireNotification("error", "CSP is preventing PEE from running, use a CSP bypass extension like PEE-companion");
+            }
+        }
+    });
+
     const meta = document.querySelector('meta[name="referrer"]') as HTMLMetaElement;
     const customStyles = document.createElement('style');