Update extension description

Author: juliandescottes

extension/template-manifest.json

@@ -1,9 +1,9 @@
 {
   "manifest_version": 2,
-  "name": "ADB binary provider",
+  "name": "Firefox DevTools ADB Extension",
   "author": "Mozilla & Android Open Source Project",
   "version": "@@VERSION@@",
-  "description": "An extension providing ADB blobs for connecting to Firefox for Android",
+  "description": "An extension providing ADB binaries for Android remote debugging in Firefox DevTools. May be automatically installed when using WebIDE or about:debugging.",
   "applications": {
     "gecko": {
       "id": "adb@mozilla.org",