Examine source code of Tab Image Saver

{
  "manifest_version": 2,
  "name": "__MSG_extension_name__",
  "default_locale": "en",
  "applications": {
    "gecko": {
      "strict_min_version": "73.0",
      "id": "tab-image-saver@mcdamo.addons.mozilla.org"
    }
  },
  "permissions": [
    "cookies",
    "downloads",
    "menus",
    "notifications",
    "storage",
    "tabs",
    "<all_urls>"
  ],
  "icons": {
    "24": "icons/tab-image-saver-v2@24.png",
    "48": "icons/tab-image-saver-v2@48.png"
  },
  "browser_action": {
    "default_icon": {
      "24": "icons/tab-image-saver-v2@24.png",
      "48": "icons/tab-image-saver-v2@48.png"
    },
    "theme_icons": [
      {
        "light": "icons/tab-image-saver-v2-light@24.png",
        "dark": "icons/tab-image-saver-v2@24.png",
        "size": 24
      },
      {
        "light": "icons/tab-image-saver-v2-light@48.png",
        "dark": "icons/tab-image-saver-v2@48.png",
        "size": 48
      }
    ],
    "default_title": "__MSG_extension_name__",
    "browser_style": true
  },
  "options_ui": {
    "page": "options.html",
    "browser_style": true,
    "open_in_tab": true
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "sidebar_action": {
    "default_title": "Tab Image Saver",
    "default_panel": "sidebar.html",
    "default_icon": "icons/tab-image-saver-v2@48.png"
  },
  "commands": {
    "default": {
      "suggested_key": {},
      "description": "__MSG_commands_default_action_label__"
    },
    "active": {
      "suggested_key": {},
      "description": "__MSG_commands_active_action_label__"
    },
    "left": {
      "suggested_key": {},
      "description": "__MSG_commands_left_action_label__"
    },
    "right": {
      "suggested_key": {},
      "description": "__MSG_commands_right_action_label__"
    },
    "all": {
      "suggested_key": {},
      "description": "__MSG_commands_all_action_label__"
    }
  },
  "version": "4.6.2",
  "description": "__MSG_extension_description__",
  "homepage_url": "https://github.com/mcdamo/tab-image-saver"
}