Examine source code of Search and Highlight

{
  "manifest_version": 2,
  "name": "Search and Highlight",
  "version": "1.3.1.1resigned1",
  "applications": {
    "gecko": {
      "id": "search_and_highlight@papaharuki.com",
      "strict_min_version": "42.0"
    }
  },
  "icons": {
    "128": "icons/searchAndHighlightIcon.png"
  },
  "browser_action": {
    "default_icon": {
      "128": "icons/searchAndHighlightIcon.png"
    },
    "default_title": "Search and Highlight",
    "default_popup": "popup/popup.html",
    "browser_style": true
  },
  "content_scripts": [
    {
      "matches": [
        "*://*/*",
        "file:///*/*"
      ],
      "js": [
        "contentScripts/scripts/contentScript.js",
        "contentScripts/scripts/highlight.js"
      ],
      "css": [
        "contentScripts/css/highlight.css"
      ],
      "all_frames": true,
      "run_at": "document_end"
    }
  ],
  "background": {
    "scripts": [
      "background/background.js"
    ]
  },
  "commands": {
    "_execute_browser_action": {
      "suggested_key": {
        "default": "Ctrl+Shift+L"
      }
    },
    "command_toggleHighlightNow": {
      "suggested_key": {
        "default": "Alt+Shift+L"
      },
      "description": "Toggle Highlight"
    }
  },
  "permissions": [
    "storage"
  ]
}