diff --git a/scripts/clean-spams.js b/scripts/clean-spams.js
index b2f89ac..ff5a850 100644
--- a/scripts/clean-spams.js
+++ b/scripts/clean-spams.js
@@ -65,7 +65,7 @@ const restoreText = "⟲ Restore comment";
 const hideText = "⟳ Hide spam"
 
 function createRestoreButton(node, restoreKey) {
-  const restoreButton = htmlToElement(`<span class="restore-comment">${restoreText}</span>`);
+  const restoreButton = htmlToElement(`<span class="additional-button">${restoreText}</span>`);
   restoreButton.addEventListener("click", () => {
     swapStoredContent(node, restoreKey);
     restoreButton.innerText = restoreButton.innerText === restoreText ? hideText : restoreText;
@@ -73,6 +73,16 @@ function createRestoreButton(node, restoreKey) {
   return restoreButton;
 }
 
+function createBlackListButton(spamDomain) {
+  const button = htmlToElement(`<span class="additional-button">✖ Blacklist domain</span>`);
+  button.addEventListener("click", async () => {
+    let { banDomains } = await browser.storage.local.get(["banDomains"]);
+    banDomains = Array.from(new Set([...banDomains, spamDomain]));
+    await browser.storage.local.set({ banDomains });
+  });
+  return button;
+}
+
 // Actions
 
 function remove(node) {
@@ -170,8 +180,32 @@ async function cleanSpams() {
     .map(count);
 
   console.log(`Found ${spamCount} spams`);
+
+  addBlackListButtons();
 }
 
+function addBlackListButtons() {
+  let links = window.document.querySelectorAll("._3-8y:not(.spam-comment-root) ._5mdd a");
+  links = Array.from(new Set(links));
+  links
+    .forEach((node) => {
+      try {
+        const spamLink = new URL(node.href).searchParams.get("u");
+        const spamDomain = spamLink ? new URL(spamLink).host : node.href;
+
+        const buttonContainer = getAncestor(node, 9, "_3-8y").querySelector("._2vq9");
+        if (!buttonContainer.querySelector(".additional-button")) {
+          buttonContainer.appendChild(htmlToElement(`<span aria-hidden="true"> · </span>`));
+          buttonContainer.appendChild(createBlackListButton(spamDomain));
+        }
+      } catch (e) {
+        console.error(e);
+        console.log(node.href);
+      }
+    })
+}
+
+
 cleanSpams().catch(console.error);
 browser.storage.local.get(["clearSpamInterval"])
   .then(({ clearSpamInterval }) => setInterval(cleanSpams, clearSpamInterval))
diff --git a/scripts/service-worker.js b/scripts/service-worker.js
index c7b8fb0..d48cce0 100644
--- a/scripts/service-worker.js
+++ b/scripts/service-worker.js
@@ -105,8 +105,8 @@ browser.runtime.onInstalled.addListener(async () => {
       installedVersion = installedVersion || "0.1";
       for (let [ver, migrate] of migrations) {
         if (installedVersion < ver) {
-          console.log(`Migrating to version ${ver}`)
-          await migrate()
+          console.log(`Migrating to version ${ver}`);
+          await migrate();
         }
       }
     } catch (e) {
diff --git a/styles/facebook-comment-plugin.css b/styles/facebook-comment-plugin.css
index c7b864e..25473f3 100644
--- a/styles/facebook-comment-plugin.css
+++ b/styles/facebook-comment-plugin.css
@@ -2,12 +2,12 @@
     background-color: #ececec;
 }
 
-.restore-comment {
+.additional-button {
     cursor: pointer;
     font-weight: bold;
     color: #3b64b6;
 }
 
-.restore-comment:hover {
+.additional-button:hover {
     text-decoration: underline;
 }