Try IT Yourself HTML5 editor Firefox

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manifest.json
{
  "minimum_chrome_version": "38",
  "browser_action": {
    "default_icon": {
      "19": "assets/icon_16.png",
      "38": "assets/icon_128.png"
    }
  },
  "name": "HTML5 Editor",
  "short_name": "HTML5 Editor for Firefox",
  "icons": {
    "16": "assets/icon_16.png",
    "128": "assets/icon_128.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "applications": {
    "gecko": {
      "id": "jid0-CBDMOg9AgpJQwFzFH21jFIukQ8I@jetpack",
      "strict_min_version": "48.0"
    }
  },
  "homepage_url": "http://www.mediamaster.eu/contatti",
  "version": "2.8.1resigned1",
  "manifest_version": 2,
  "content_security_policy": "script-src 'self'; img-src 'self' data:; style-src 'self' 'unsafe-inline'; font-src 'self'; default-src 'self'; worker-src 'self'; frame-src *",
  "permissions": [
    "tabs",
    "activeTab",
    "downloads"
  ],
  "description": "HTML5 Editor with CSS, JS, HTML validator and beautify code"
}

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