Examine source code of DewanEja11

{
  "manifest_version": 2,
  "name": "DewanEja11",
  "description": "This extension shows spelling and grammar proofing results for Malay language.",
  "version": "1.0",
  "icons": {
    "48": "icon.png",
    "96": "icon@2x.png"
  },
  "browser_action": {
    "default_icon": "icon.png",
    "default_popup": "popup.html",
    "default_title": "Check Malay spelling and grammar with DewanEja11"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "http://*/*",
        "https://*/*",
        "file:///*"
      ],
      "js": [
        "content.js"
      ],
      "all_frames": true,
      "run_at": "document_end"
    }
  ],
  "permissions": [
    "activeTab",
    "http://*/",
    "https://*/"
  ]
}