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manifest.json
{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "manifest_version": 2,
  "name": "Trello No Strikethrough",
  "description": "Removes the strikethrough for completed tasks on Trello",
  "icons": {
    "128": "icon.png"
  },
  "version": "1.0.2",
  "background": {
    "page": "popup.html"
  },
  "browser_action": {
    "default_icon": "icon.png",
    "default_popup": "popup.html",
    "default_title": "Trello No Strikethrough"
  },
  "content_scripts": [
    {
      "matches": [
        "*://trello.com/*"
      ],
      "css": [
        "mystyles.css"
      ]
    }
  ],
  "permissions": [
    "https://trello.com/*"
  ]
}