diff --git a/main.js b/main.js
new file mode 100644
index 0000000..186453f
--- /dev/null
+++ b/main.js
@@ -0,0 +1,8 @@
+console.log("The extension is up and running");
+
+var images = document.getElementsByTagName('img')
+
+for (elt of images){
+   elt.src = `${browser.runtime.getURL("midnight.gif")}`
+   elt.alt = 'an alt text'
+}
\ No newline at end of file
diff --git a/manifest.json b/manifest.json
new file mode 100644
index 0000000..d462510
--- /dev/null
+++ b/manifest.json
@@ -0,0 +1,19 @@
+{
+    "manifest_version":2,
+    "version":"0.0.1",
+    "name":"Midnightify",
+    "icons": {
+        "48": "midnight-icon.gif",
+        "96": "midnight-icon.gif"
+      },      
+    "content_scripts":[
+        {
+         "matches":["<all_urls>"],
+         "js":["main.js"]
+        }
+      ],
+      "web_accessible_resources": [
+            "midnight.gif"
+      ]
+  }
+  
\ No newline at end of file
diff --git a/midnight-icon.gif b/midnight-icon.gif
new file mode 100644
index 0000000..ffe23de
Binary files /dev/null and b/midnight-icon.gif differ
diff --git a/midnight-icon.png b/midnight-icon.png
new file mode 100644
index 0000000..c23bd27
Binary files /dev/null and b/midnight-icon.png differ
diff --git a/midnight.gif b/midnight.gif
new file mode 100644
index 0000000..6f814e3
Binary files /dev/null and b/midnight.gif differ