Twitter Content Warning Buttons

This extension will hide sensitive tweets with content warnings/notes behind a mask.
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manifest.json
{
  "manifest_version": 2,
  "name": "Twitter Content Warning Buttons",
  "description": "This extension will hide sensitive tweets with content warnings/notes behind a mask.",
  "version": "0.3",
  "permissions": [
    "*://twitter.com/*"
  ],
  "icons": {
    "48": "icon.png",
    "96": "icon@2x.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://twitter.com/*"
      ],
      "js": [
        "js/content_script.js"
      ]
    }
  ]
}