Examine source code of casemate

{
  "description": "Extension to manage case logs",
  "manifest_version": 2,
  "name": "casemate",
  "version": "1.17resigned1",
  "icons": {
    "48": "icons/casemate_48.png",
    "128": "icons/casemate_48.png"
  },
  "applications": {
    "gecko": {
      "id": "casemate@cisco.com",
      "strict_min_version": "50.0"
    }
  },
  "web_accessible_resources": [
    "icons/*.png"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "permissions": [
    "nativeMessaging",
    "activeTab",
    "downloads",
    "notifications"
  ],
  "browser_action": {
    "default_icon": "icons/casemate_48.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.visual.force.com/apex/ProductSearchPage*"
      ],
      "match_about_blank": true,
      "all_frames": true,
      "js": [
        "iframeContent.js"
      ],
      "run_at": "document_idle"
    },
    {
      "matches": [
        "*://*.visual.force.com/apex/casemonapp*"
      ],
      "match_about_blank": true,
      "all_frames": true,
      "js": [
        "casemonappContent.js"
      ],
      "run_at": "document_idle"
    },
    {
      "matches": [
        "*://*.visual.force.com/apex/xmainpane*"
      ],
      "match_about_blank": true,
      "all_frames": true,
      "js": [
        "mainContent.js"
      ],
      "run_at": "document_idle"
    }
  ]
}