diff --git a/contentScript.js b/contentScript.js
new file mode 100644
index 0000000..13461d1
--- /dev/null
+++ b/contentScript.js
@@ -0,0 +1,34 @@
+// répéte en boucle toutes les 1 secondes
+setInterval(() => {
+  const notesDevoir = document.querySelectorAll('.note-devoir');
+  const noteEleve = document.querySelectorAll('.ie-titre-couleur-lowercase');
+  const noteLaPlusHaute = document.querySelectorAll('.ie-texte');
+  const moyenneMatiere = document.querySelectorAll('.ie-titre-gros');
+  const moyenneGenerale = document.querySelectorAll('.flex-contain', 'm-all-xl', 'justify-between');
+
+  notesDevoir.forEach(element => {
+    element.textContent = "20,00";
+  });
+
+  noteEleve.forEach(element => {
+    element.innerHTML = "<span>Note élève : </span><span>20,00</span>";
+  });
+
+  noteLaPlusHaute.forEach(element => {
+    if (element.innerHTML.includes("<span>Note la plus haute :</span>")) {
+      element.innerHTML = "<span>Note la plus haute : </span><span>20,00</span>";
+    }
+    if (element.innerHTML.includes("<span>Moyenne la plus haute :</span>")) {
+      element.innerHTML = "<span>Moyenne la plus haute : </span><span>20,00</span>";
+    }
+  });
+  moyenneMatiere.forEach(element => {
+    if (element.parentElement.classList.contains('flex-contain') && !element.parentElement.classList.contains('m-all-xl', 'justify-between')) {
+      element.textContent = "20,00";
+    }
+  });
+  moyenneGenerale.forEach(element => {
+    element.innerHTML = "<span>Moyenne générale élève : </span><span>20,00</span>";
+  })
+
+}, 100);
\ No newline at end of file
diff --git a/manifest.json b/manifest.json
new file mode 100644
index 0000000..ab17fd3
--- /dev/null
+++ b/manifest.json
@@ -0,0 +1,18 @@
+{
+  "manifest_version": 3,
+  "name": "Modificateur de notes",
+  "version": "1.0",
+  "permissions": [
+    "activeTab",
+    "scripting",
+    "storage"
+  ],
+  "content_scripts": [
+    {
+      "matches": [
+                  "https://0332870r.index-education.net/pronote/eleve.html"
+                ],
+      "js": ["contentScript.js"]
+    }
+  ]
+}