diff --git a/manifest.json b/manifest.json
index 1b57304d..524cf233 100644
--- a/manifest.json
+++ b/manifest.json
@@ -37,6 +37,11 @@
             "matches": ["*://*.steamcommunity.com/*/tradeoffers/*"],
             "js": ["src/lib/page_scripts/trade_offers.js"],
             "css": ["src/global.css"]
+        },
+        {
+            "matches": ["*://*.steamcommunity.com/id/*", "*://*.steamcommunity.com/profiles/*"],
+            "js": ["src/lib/page_scripts/profile.js"],
+            "css": ["src/global.css"]
         }
     ],
     "background": {
diff --git a/src/lib/components/profile/comment_warning.ts b/src/lib/components/profile/comment_warning.ts
new file mode 100644
index 00000000..64741a77
--- /dev/null
+++ b/src/lib/components/profile/comment_warning.ts
@@ -0,0 +1,70 @@
+import {css, html} from 'lit';
+
+import {CustomElement, InjectAfter, InjectionMode} from '../injectors';
+import {FloatElement} from '../custom';
+import '../common/ui/steam-button';
+import {state} from 'lit/decorators.js';
+import {Observe} from '../../utils/observers';
+
+@CustomElement()
+@InjectAfter('.commentthread_area .commentthread_header', InjectionMode.ONCE)
+export class CommentWarning extends FloatElement {
+    @state()
+    show = false;
+
+    static styles = [
+        ...FloatElement.styles,
+        css`
+            .container {
+                background-color: rgba(235, 87, 87, 0.05);
+                color: #de6667;
+                border-radius: 6px;
+                padding: 8px;
+                margin: 5px;
+                font-size: 14px;
+            }
+        `,
+    ];
+
+    private getRawCommentBoxText(): string {
+        const elems = document.getElementsByClassName('commentthread_textarea');
+        if (elems.length === 0) {
+            return '';
+        }
+
+        const elem = elems[0] as HTMLTextAreaElement;
+        return elem.value || '';
+    }
+
+    async connectedCallback() {
+        super.connectedCallback();
+
+        Observe(
+            () => {
+                return this.getRawCommentBoxText();
+            },
+            () => {
+                this.refreshWarningApplicable();
+            }
+        );
+    }
+
+    refreshWarningApplicable() {
+        const text = this.getRawCommentBoxText();
+        const words = new Set(text.toLowerCase().split(' '));
+
+        const hasTriggerWord = ['buy', 'sell', 'bought', 'sold', 'csfloat'].some((e) => words.has(e));
+        this.show = hasTriggerWord;
+    }
+
+    render() {
+        if (!this.show) {
+            return html``;
+        }
+
+        return html`<div class="container">
+            <b>WARNING:</b> Commenting on profiles with words relating to buying and selling CS2 items
+            <b>WILL</b> result in a Steam community ban!
+        </div>`;
+    }
+}
diff --git a/src/lib/page_scripts/profile.ts b/src/lib/page_scripts/profile.ts
new file mode 100644
index 00000000..3f2b8271
--- /dev/null
+++ b/src/lib/page_scripts/profile.ts
@@ -0,0 +1,6 @@
+import {init} from './utils';
+import '../components/profile/comment_warning';
+
+init('src/lib/page_scripts/profile.js', main);
+
+async function main() {}