Examine source code of FluxDown

{
  "manifest_version": 2,
  "name": "__MSG_extensionName__",
  "description": "__MSG_extensionDescription__",
  "version": "0.3.0",
  "icons": {
    "16": "/icon/16.png",
    "32": "/icon/32.png",
    "48": "/icon/48.png",
    "128": "/icon/128.png"
  },
  "default_locale": "en",
  "permissions": [
    "downloads",
    "downloads.shelf",
    "cookies",
    "webRequest",
    "webRequestBlocking",
    "storage",
    "alarms",
    "notifications",
    "activeTab",
    "tabs",
    "nativeMessaging",
    "contextMenus",
    "<all_urls>"
  ],
  "web_accessible_resources": [
    "/fetch-interceptor.js",
    "content-scripts/resource-ui.css"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "fluxdown@fluxdown.app",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "commands": {
    "toggle-intercept": {
      "suggested_key": {
        "default": "Alt+Shift+D"
      },
      "description": "Toggle download interception"
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_title": "FluxDown",
    "default_popup": "popup.html"
  },
  "options_ui": {
    "open_in_tab": true,
    "page": "options.html"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "run_at": "document_idle",
      "js": [
        "content-scripts/resource-detector.js",
        "content-scripts/resource-ui.js"
      ]
    }
  ]
}