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manifest.json

{
  "manifest_version": 2,
  "name": "LibreJS/USPS compatibility",
  "version": "1.1resigned1",
  "author": "Nathan Nichols",
  "description": "LibreJS compatible USPS.com shipping calculator.",
  "applications": {
    "gecko": {
      "id": "FreeUSPS@0xbeef.coffee",
      "strict_min_version": "42.0"
    }
  },
  "icons": {
    "16": "icons/I16.png",
    "48": "icons/I48.png",
    "128": "icons/I128.png"
  },
  "permissions": [
    "webRequest",
    "webRequestBlocking",
    "*://www.postcalc.usps.com/*"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "https://postcalc.usps.com/*"
      ],
      "js": [
        "main.js"
      ]
    }
  ]
}