I know what I'm doing Firefox

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manifest.json
{
  "manifest_version": 2,
  "name": "__MSG_extensionName__",
  "description": "__MSG_extensionDescription__",
  "default_locale": "en",
  "icons": {
    "48": "icons/icon.svg"
  },
  "version": "1.0",
  "permissions": [
    "<all_urls>",
    "notifications",
    "storage",
    "webRequest",
    "webRequestBlocking"
  ],
  "browser_action": {
    "default_icon": {
      "32": "icons/icon.svg"
    },
    "default_title": "Content script",
    "default_popup": "popup/index.html",
    "browser_style": true
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "expose_api.js"
      ],
      "run_at": "document_start"
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{64beab4a-859a-425c-bd50-99afea8c41d0}"
    }
  }
}

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