diff --git a/src/config.js b/src/config.js
index ec7332c..63b976d 100644
--- a/src/config.js
+++ b/src/config.js
@@ -4,6 +4,13 @@ window.packageConfig = [
     file: 'package.json',
     registry: window.registry.npm,
     parse: window.parser.json,
-    keys: ['dependencies', 'devDependencies']
+    keys: ['dependencies', 'devDependencies'],
+  },
+  {
+    name: 'composer',
+    file: 'composer.json',
+    registry: window.registry.composer,
+    parse: window.parser.json,
+    keys: ['require', 'require-dev'],
   },
 ];
diff --git a/src/display.js b/src/display.js
index 0689c92..dbb378d 100644
--- a/src/display.js
+++ b/src/display.js
@@ -26,7 +26,9 @@ function display(deps, devDeps, config) {
 }
 
 function addDependencies(body, deps, registry, dev) {
-  body.appendChild(subHeader(dev))
+  if (deps) {
+    body.appendChild(subHeader(dev))
+  }
 
   for (dep in deps) {
     var row = document.createElement('tr');
@@ -42,7 +44,7 @@ function subHeader(dev) {
   var row = document.createElement('tr');
   var td = document.createElement('td');
   var header = document.createElement('strong');
-  
+
   header.textContent = dev ? 'Development Dependencies' : 'Project Dependencies';
   td.colSpan = tableHeaders.length;
   td.appendChild(header);
diff --git a/src/manifest.json b/src/manifest.json
index 04f6a09..998ef1a 100644
--- a/src/manifest.json
+++ b/src/manifest.json
@@ -17,12 +17,7 @@
     }
   ],
   "permissions": [
-    "https://registry.npmjs.org/"
-  ],
-  "background": {
-    "scripts": [
-      "registry.js"
-    ],
-    "persistent": false
-  }
+    "https://registry.npmjs.org/",
+    "https://packagist.org/"
+  ]
 }
diff --git a/src/registry.js b/src/registry.js
index 88c5b03..c3cd9e6 100644
--- a/src/registry.js
+++ b/src/registry.js
@@ -15,10 +15,22 @@ function npm(packageName, callback) {
   }
 }
 
+function composer(packageName, callback) {
+  var url = registryConfig.composer + packageName;
+  getExtraPackageData(url, listener);
+
+  function listener() {
+    var data = JSON.parse(this.responseText)['results'][0];
+    callback('-', data.description, data.repository);
+  }
+}
+
 var registryConfig = {
   npm: 'https://registry.npmjs.org/',
+  composer: 'https://packagist.org/search.json?q=',
 };
 
 window.registry = {
   npm: npm,
+  composer: composer,
 };