Using MIME types in addition to plugin name to differentiate between plugins.

chrome/browser/resources/plugin_metadata/plugins_linux.json

 {
   "google-talk": {
     "mime_types": [
     ],
     "versions": [
       {
         "version": "0",
         "status": "up_to_date",
         "comment": "'Google Talk Plugin' and 'Google Talk Plugin Video Accelerator' use two completely different versioning schemes, so we can't define a minimum version."
       }
@@ skipping 56 matching lines @@
     "help_url": "https://support.google.com/chrome/?p=plugin_java",
     "url": "http://java.com/download",
     "displayurl": true,
     "group_name_matcher": "Java"
   },
   "adobe-flash-player": {
     "mime_types": [
       "application/futuresplash",
       "application/x-shockwave-flash"
     ],
+    "matching_mime_types": [
+      "application/futuresplash"
+    ],
     "versions": [
       {
         "version": "11.1.102",
         "status": "up_to_date",
         "reference": "http://www.adobe.com/support/security/bulletins/apsb12-03.html"
       }
     ],
     "lang": "en-US",
     "name": "Adobe Flash Player",
     "help_url": "https://support.google.com/chrome/?p=plugin_flash",
     "url": "http://get.adobe.com/flashplayer/",
     "displayurl": true,
     "group_name_matcher": "Shockwave Flash"
   },
+  "lightspark": {
+    "mime_types": [
+      "application/x-lightspark",
+    ],
+    "matching_mime_types": [
+      "application/x-lightspark"
+    ],
+    "versions": [
+      {
+        "version": "0",
+        "status": "requires_authorization"
+      }
+    ],
+    "lang": "en-US",
+    "name": "Lightspark",
+    "displayurl": true,
+    "url": "https://launchpad.net/lightspark",
+    "group_name_matcher": "Shockwave Flash"
+  },
   "redhat-icetea-java": {
     "mime_types": [
     ],
     "versions": [
       {
         "version": "1.8.13",
         "status": "requires_authorization",
         "reference": "http://blog.fuseyism.com/index.php/2012/02/15/security-icedtea6-1-8-13-1-9-13-1-10-6-and-icedtea-2-0-1-released/"
       },
       {
@@ skipping 37 matching lines @@
       {
         "version": "0",
         "status": "up_to_date",
         "comment": "Google Chrome PDF has no version information."
       }
     ],
     "name": "Chrome PDF Viewer",
     "group_name_matcher": "Chrome PDF Viewer"
   }
 }