diff --git a/source/content-scripts/features/anonymize-usernames.ts b/source/content-scripts/features/anonymize-usernames.ts
index 7952653..e5761b2 100644
--- a/source/content-scripts/features/anonymize-usernames.ts
+++ b/source/content-scripts/features/anonymize-usernames.ts
@@ -1,15 +1,23 @@
-import {log, querySelectorAll} from "../../utilities/exports.js";
+import {hashSha256, log, querySelectorAll} from "../../utilities/exports.js";
+import {
+  type AnonymizeUsernamesData,
+  ReplacementType,
+} from "../../storage/exports.js";
 
-export function runAnonymizeUsernamesFeature() {
-  const count = anonymizeUsernames();
+export async function runAnonymizeUsernamesFeature(
+  data: AnonymizeUsernamesData,
+) {
+  const count = await anonymizeUsernames(data);
   log(`Anonymize Usernames: Initialized for ${count} user links.`);
 }
 
-function anonymizeUsernames(): number {
+async function anonymizeUsernames(
+  data: AnonymizeUsernamesData,
+): Promise<number> {
   const usernameElements = querySelectorAll<HTMLElement>(
     ".link-user:not(.trx-anonymized)",
   );
-  const replacements = generateReplacements(usernameElements);
+  const replacements = await generateReplacements(usernameElements, data);
 
   for (const element of usernameElements) {
     let username = usernameFromElement(element);
@@ -28,14 +36,36 @@ function anonymizeUsernames(): number {
   return usernameElements.length;
 }
 
-function generateReplacements(elements: HTMLElement[]): Record<string, string> {
+async function generateReplacements(
+  elements: HTMLElement[],
+  data: AnonymizeUsernamesData,
+): Promise<Record<string, string>> {
   const usernames = new Set(
     elements.map((element) => usernameFromElement(element).replace(/@/g, "")),
   );
 
   const replacements: Record<string, string> = {};
   for (const [index, username] of Array.from(usernames).entries()) {
-    replacements[username] = `Anonymous ${index + 1}`;
+    switch (data.replacementType) {
+      case ReplacementType.Hashed: {
+        const hash = await hashSha256(username);
+        replacements[username] = hash.slice(0, 10).toUpperCase();
+        break;
+      }
+
+      case ReplacementType.Numerical: {
+        replacements[username] = `Anonymous ${index + 1}`;
+        break;
+      }
+
+      default: {
+        throw new Error(
+          `Unknown ReplacementType in AnonymizeUsernamesData: ${JSON.stringify(
+            data,
+          )}`,
+        );
+      }
+    }
   }
 
   return replacements;
diff --git a/source/content-scripts/setup.tsx b/source/content-scripts/setup.tsx
index 51a1370..b0c85d0 100644
--- a/source/content-scripts/setup.tsx
+++ b/source/content-scripts/setup.tsx
@@ -82,8 +82,11 @@ async function initialize() {
   }
 
   if (anonymizeUsernamesEnabled) {
-    observerFeatures.push(() => {
-      runAnonymizeUsernamesFeature();
+    const anonymizeUsernamesData = await fromStorage(
+      Feature.AnonymizeUsernames,
+    );
+    observerFeatures.push(async () => {
+      await runAnonymizeUsernamesFeature(anonymizeUsernamesData.value);
     });
   }