Automatically reveal hidden HTML elements Firefox

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manifest.json
{
  "manifest_version": 2,
  "name": "Reveal hidden HTML",
  "version": "1.7resigned1",
  "author": "Nathan Nichols",
  "description": "Unhides hidden HTML. Also, has a tool that fixes some websites with broken form validation Javascript by forcing an HTTP post.",
  "applications": {
    "gecko": {
      "id": "SubmitMe@0xbeef.coffee",
      "strict_min_version": "42.0"
    }
  },
  "icons": {
    "16": "icons/16x16.png",
    "48": "icons/48x48.png"
  },
  "permissions": [
    "contextMenus",
    "webRequest",
    "activeTab",
    "notifications"
  ],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "passive_improve_css.js"
      ]
    }
  ],
  "page_action": {
    "browser_style": true,
    "default_icon": {
      "16": "icons/16x16.png",
      "48": "icons/48x48.png"
    },
    "default_title": "Submit Me",
    "default_popup": "popup/popup.html"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  }
}

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