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manifest.json

{
  "manifest_version": 2,
  "name": "Custom CSS",
  "description": "Overwrite page CSS",
  "version": "1.1.1",
  "short_name": "ext-custom-css",
  "icons": {
    "16": "icons/icon16.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "browser_action": {
    "default_icon": "icons/icon16.png",
    "default_popup": "popup.html",
    "default_title": "Edit page CSS"
  },
  "content_scripts": [
    {
      "matches": [
        "http://*/*",
        "https://*/*"
      ],
      "js": [
        "main.js"
      ]
    }
  ],
  "permissions": [
    "tabs",
    "storage",
    "http://*/",
    "https://*/"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{7218d86c-cce3-434b-aeee-14163dc8b2fe}"
    }
  }
}