Implemented whitelist.

mango.js

@@ -1,9 +1,26 @@
-var styles = `
-    * {
+console.log("[Mango] Let's get the business done.")
+
+function checkWhitelist(url) {
+    return browser.storage.local.get("whitelist").then((result) => {
+      const whitelist = result.whitelist || [];
+      return whitelist.includes(url);
+    });
+  }
+  
+  const currentHostname = location.hostname;
+  
+  checkWhitelist(currentHostname).then((isWhitelisted) => {
+    if (!isWhitelisted) {
+        const styles = `
+        * {
         border-radius: 0 !important;
+        }
+        `;
+        const injectedStyle = document.createElement("style");
+        injectedStyle.type = "text/css";
+        injectedStyle.innerText = styles;
+        document.head.appendChild(injectedStyle);
+    } else {
+        console.log("[Mango] Mercy! This page is whitelisted.")
     }
-`
-var injectedStyle = document.createElement("style")
-injectedStyle.type = "text/css"
-injectedStyle.innerText = styles
-document.head.appendChild(injectedStyle)
+  });