Double Click New Tab Firefox

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manifest.json
{
  "manifest_version": 2,
  "name": "Double Click New Tab",
  "description": "Open links as background tabs by Double clicking links",
  "background": {
    "scripts": [
      "js/background.js"
    ]
  },
  "icons": {
    "16": "img/icon16.png",
    "32": "img/icon32.png",
    "48": "img/icon48.png",
    "128": "img/icon128.png"
  },
  "content_scripts": [
    {
      "all_frames": true,
      "match_about_blank": true,
      "run_at": "document_start",
      "js": [
        "js/contentscript.js"
      ],
      "matches": [
        "<all_urls>"
      ]
    }
  ],
  "applications": {
    "gecko": {
      "id": "Double_Click_New_Tab_senna5150ando@gmail.com",
      "strict_min_version": "57.0"
    }
  },
  "options_ui": {
    "open_in_tab": true,
    "page": "options.html"
  },
  "content_security_policy": "script-src 'self'; object-src 'self'",
  "minimum_chrome_version": "22",
  "permissions": [
    "storage",
    "tabs",
    "clipboardWrite",
    "clipboardRead",
    "downloads"
  ],
  "version": "1.1resigned1"
}

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