Examine source code of Unicode Keyboard

{
  "manifest_version": 2,
  "name": "Unicode Keyboard",
  "version": "0.4resigned1",
  "description": "A keyboard-navigable Input panel that can search unicode characters by character name, code block and general category. Focus on a text area and press Alt+U to open. Alt+U to close again.",
  "commands": {
    "open-keyboard": {
      "suggested_key": {
        "default": "Alt+U"
      },
      "description": "Toggle/Focus the input panel"
    },
    "latex-input": {
      "suggested_key": {
        "default": "Alt+Shift+L"
      },
      "description": "Enable latex input mode"
    }
  },
  "icons": {
    "48": "64.png",
    "96": "96.png",
    "128": "128.png"
  },
  "background": {
    "scripts": [
      "lib/latex-to-unicode.js",
      "background/ucd.js",
      "background/main.js"
    ]
  },
  "permissions": [
    "storage",
    "activeTab",
    "tabs"
  ],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content/top.js"
      ]
    },
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content/frame.js"
      ],
      "all_frames": true,
      "run_at": "document_end"
    }
  ],
  "applications": {
    "gecko": {
      "id": "unicode-keyboard@the8472",
      "strict_min_version": "48.0"
    }
  },
  "web_accessible_resources": [
    "web/*.html",
    "web/*.js"
  ]
}