Examine source code of Screenshot

{
  "optional_permissions": [
    "tabs",
    "clipboardWrite"
  ],
  "commands": {
    "last-used-action": {
      "suggested_key": {
        "default": "Ctrl+Shift+Y",
        "mac": "Command+Shift+Y"
      },
      "description": "__MSG_options_label_last_action_hotkey__"
    },
    "capture-entire-page-action": {
      "suggested_key": {
        "default": "Alt+Shift+1",
        "mac": "Command+Shift+1"
      },
      "description": "__MSG_action_capture_entire_lite__"
    },
    "capture-selection-action": {
      "suggested_key": {
        "default": "Alt+Shift+4",
        "mac": "Command+Shift+6"
      },
      "description": "__MSG_action_capture_selection_lite__"
    },
    "capture-visible-page-action": {
      "suggested_key": {
        "default": "Alt+Shift+3",
        "mac": "Command+Shift+2"
      },
      "description": "__MSG_action_capture_visible_lite__"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{6bbf9679-6ce3-4a46-808d-b4738ea677dd}"
    }
  },
  "name": "Screenshot",
  "short_name": "Screenshot",
  "icons": {
    "16": "images/sss_16.png",
    "32": "images/sss_32.png",
    "48": "images/sss_48.png",
    "128": "images/sss_128.png"
  },
  "web_accessible_resources": [
    "images/*.gif"
  ],
  "background": {
    "scripts": [
      "scripts/fsXBrowserSupport.js",
      "scripts/fsPreferences.js",
      "scripts/fsUtils.js",
      "scripts/fsCommands.js",
      "scripts/fsSSS.js",
      "scripts/fsNativeAPISupport.js",
      "scripts/fsBackground.js",
      "scripts/fsWASMAPISupport.js",
      "scripts/fsAutomation.js"
    ]
  },
  "options_ui": {
    "page": "fsOptions.html",
    "browser_style": true
  },
  "version": "3.6.6",
  "manifest_version": 2,
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "all_frames": true,
      "js": [
        "scripts/fsPage.js"
      ]
    }
  ],
  "content_security_policy": "script-src 'self'  'unsafe-eval'; object-src 'self';",
  "browser_action": {
    "default_popup": "fsPopup.html",
    "default_title": "FireShot - Capture page",
    "default_icon": "images/sss_48.png",
    "browser_style": true
  },
  "default_locale": "en",
  "permissions": [
    "tabs",
    "activeTab",
    "<all_urls>",
    "webRequest",
    "webNavigation",
    "webRequestBlocking",
    "contextMenus",
    "nativeMessaging",
    "downloads",
    "storage"
  ]
}