Examine source code of POST Image

{
  "manifest_version": 2,
  "name": "POST Image",
  "version": "1.2",
  "icons": {
    "200": "icon.png"
  },
  "description": "This extension allows you to right click an image and upload it to an image sharing website.",
  "permissions": [
    "contextMenus",
    "tabs",
    "storage",
    "notifications",
    "clipboardWrite",
    "http://*/*",
    "https://*/*"
  ],
  "background": {
    "scripts": [
      "upload.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "http://*/*",
        "https://*/*"
      ],
      "css": [],
      "js": [
        "upload.js"
      ]
    }
  ],
  "options_ui": {
    "page": "settings.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{a8e3dffd-6d7f-4aaf-915e-12f8e8c7a148}"
    }
  }
}