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."
       }
     ],
     "name": "Google Talk",
     "group_name_matcher": "Google Talk"
   },
   "java-runtime-environment": {
     "mime_types": [
-      "application/x-java-applet",
-      "application/x-java-applet,version=1.1",
-      "application/x-java-applet,version=1.1.1",
-      "application/x-java-applet,version=1.1.2",
-      "application/x-java-applet,version=1.1.3",
-      "application/x-java-applet,version=1.2",
-      "application/x-java-applet,version=1.2.1",
-      "application/x-java-applet,version=1.2.2",
-      "application/x-java-applet,version=1.3",
-      "application/x-java-applet,version=1.3.1",
-      "application/x-java-applet,version=1.4",
-      "application/x-java-applet,version=1.4.1",
-      "application/x-java-applet,version=1.4.2",
-      "application/x-java-applet,version=1.5",
-      "application/x-java-applet,version=1.6",
-      "application/x-java-applet,version=1.7",
-      "application/x-java-bean",
-      "application/x-java-bean,version=1.1",
-      "application/x-java-bean,version=1.1.1",
-      "application/x-java-bean,version=1.1.2",
-      "application/x-java-bean,version=1.1.3",
-      "application/x-java-bean,version=1.2",
-      "application/x-java-bean,version=1.2.1",
-      "application/x-java-bean,version=1.2.2",
-      "application/x-java-bean,version=1.3",
-      "application/x-java-bean,version=1.3.1",
-      "application/x-java-bean,version=1.4",
-      "application/x-java-bean,version=1.4.1",
-      "application/x-java-bean,version=1.4.2",
-      "application/x-java-bean,version=1.5",
-      "application/x-java-bean,version=1.6",
-      "application/x-java-bean,version=1.7",
-      "application/x-java-vm"
+      { "mime_type": "application/x-java-applet" },
+      { "mime_type": "application/x-java-applet,version=1.1" },
+      { "mime_type": "application/x-java-applet,version=1.1.1" },
+      { "mime_type": "application/x-java-applet,version=1.1.2" },
+      { "mime_type": "application/x-java-applet,version=1.1.3" },
+      { "mime_type": "application/x-java-applet,version=1.2" },
+      { "mime_type": "application/x-java-applet,version=1.2.1" },
+      { "mime_type": "application/x-java-applet,version=1.2.2" },
+      { "mime_type": "application/x-java-applet,version=1.3" },
+      { "mime_type": "application/x-java-applet,version=1.3.1" },
+      { "mime_type": "application/x-java-applet,version=1.4" },
+      { "mime_type": "application/x-java-applet,version=1.4.1" },
+      { "mime_type": "application/x-java-applet,version=1.4.2" },
+      { "mime_type": "application/x-java-applet,version=1.5" },
+      { "mime_type": "application/x-java-applet,version=1.6" },
+      { "mime_type": "application/x-java-applet,version=1.7" },
+      { "mime_type": "application/x-java-bean" },
+      { "mime_type": "application/x-java-bean,version=1.1" },
+      { "mime_type": "application/x-java-bean,version=1.1.1" },
+      { "mime_type": "application/x-java-bean,version=1.1.2" },
+      { "mime_type": "application/x-java-bean,version=1.1.3" },
+      { "mime_type": "application/x-java-bean,version=1.2" },
+      { "mime_type": "application/x-java-bean,version=1.2.1" },
+      { "mime_type": "application/x-java-bean,version=1.2.2" },
+      { "mime_type": "application/x-java-bean,version=1.3" },
+      { "mime_type": "application/x-java-bean,version=1.3.1" },
+      { "mime_type": "application/x-java-bean,version=1.4" },
+      { "mime_type": "application/x-java-bean,version=1.4.1" },
+      { "mime_type": "application/x-java-bean,version=1.4.2" },
+      { "mime_type": "application/x-java-bean,version=1.5" },
+      { "mime_type": "application/x-java-bean,version=1.6" },
+      { "mime_type": "application/x-java-bean,version=1.7" },
+      { "mime_type": "application/x-java-vm" }
     ],
     "versions": [
       {
         "version": "1.6.0.33",
         "status": "requires_authorization"
       },
       {
         "version": "1.7",
         "status": "out_of_date"
       },
       {
         "version": "1.7.0.5",
         "status": "requires_authorization"
       }
     ],
     "lang": "en-US",
     "name": "Java(TM)",
     "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"
+      { "mime_type": "application/futuresplash", "used_in_matching": true },
+      { "mime_type": "application/x-shockwave-flash" }
     ],
     "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": [
+      { 
+        "mime_type": "application/x-lightspark",
+        "used_in_matching": true
+      },
+      { 
+        "mime_type": "application/x-shockwave-flash"
+      }
+    ],
+    "versions": [
+      {
+        "version": "11.1.102",
+        "status": "up_to_date",
+        "reference": "http://www.adobe.com/support/security/bulletins/apsb12-03.html"
+      }
+    ],
+    "name": "Light Spark",
+    "displayurl": true,
+    "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"
   }
 }