Examine source code of Awesome Screenshot & Screen Recorder

{
  "manifest_version": 2,
  "version": "4.3.7.21",
  "default_locale": "en",
  "name": "__MSG_extName__",
  "description": "__MSG_extDesc__",
  "browser_specific_settings": {
    "gecko": {
      "id": "jid0-GXjLLfbCoAx0LcltEdFrEkQdQPI@jetpack",
      "strict_min_version": "60.0"
    }
  },
  "permissions": [
    "activeTab",
    "tabs",
    "downloads",
    "<all_urls>",
    "storage",
    "unlimitedStorage",
    "clipboardWrite",
    "cookies"
  ],
  "background": {
    "page": "background.html"
  },
  "options_ui": {
    "open_in_tab": true,
    "page": "option-react.html"
  },
  "icons": {
    "16": "images/icon16.png",
    "32": "images/icon32.png",
    "48": "images/icon48.png",
    "128": "images/icon128.png"
  },
  "commands": {
    "_execute_browser_action": {
      "suggested_key": {
        "default": "Alt+A"
      },
      "description": "Open popup menu"
    }
  },
  "optional_permissions": [
    "downloads"
  ],
  "browser_action": {
    "default_icon": {
      "19": "images/icon19.png",
      "38": "images/icon38.png"
    },
    "default_title": "__MSG_extName__",
    "default_popup": "popup.html"
  },
  "content_security_policy": "script-src 'self'; object-src 'self'",
  "web_accessible_resources": [
    "images/success.gif",
    "images/clear.png",
    "images/icon19.png",
    "images/button_icon_cancel.png",
    "images/button_icon_cancel@2x.png",
    "images/button_icon_cancel_hover.png",
    "images/button_icon_cancel_hover@2x.png",
    "images/button_icon_capture.png",
    "images/button_icon_capture@2x.png",
    "images/button_icon_capture_hover.png",
    "images/button_icon_capture_hover@2x.png"
  ],
  "content_scripts": [
    {
      "js": [
        "javascripts/libs/dragresize.js",
        "javascripts/content.bundle.js",
        "javascripts/desStatus.js"
      ],
      "css": [
        "stylesheets/selected.css"
      ],
      "matches": [
        "http://*/*",
        "https://*/*"
      ],
      "exclude_globs": [
        "https://awesomescreenshot.com/save-local-flash/SaveToDisk.html"
      ],
      "all_frames": true,
      "run_at": "document_end"
    }
  ]
}