Examine source code of SkyWall

{
  "name": "skywall",
  "version": "1.7.6",
  "manifest_version": 2,
  "description": "The SkyWall add-on for Firefox provides the same delay-based whitelist control from the PC version to Android",
  "icons": {
    "16": "assets/images/icon16.png",
    "32": "assets/images/icon32.png",
    "48": "assets/images/icon48.png",
    "128": "assets/images/icon128.png"
  },
  "browser_action": {
    "default_popup": "popup.html",
    "browser_style": true,
    "default_title": "SkyWall"
  },
  "permissions": [
    "storage",
    "activeTab",
    "webRequest",
    "webRequestBlocking",
    "<all_urls>",
    "downloads"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "skywall@skywall.net",
      "strict_min_version": "79.0"
    }
  },
  "options_ui": {
    "page": "options.html",
    "browser_style": false,
    "open_in_tab": true
  },
  "background": {
    "page": "background.html"
  },
  "web_accessible_resources": [
    "redirect.html",
    "faq.html"
  ],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "assets/js/content.js"
      ]
    }
  ]
}