Examine source code of ProxySetter

{
  "manifest_version": 2,
  "author": "Tony Ye",
  "name": "ProxySetter",
  "background": {
    "scripts": [
      "setProxy.js"
    ]
  },
  "applications": {
    "gecko": {
      "id": "jid1-BAuVAdBr8gFlOQ@tony",
      "strict_min_version": "60.0a1"
    }
  },
  "description": "Automatically set proxy definitions on loading a certain url",
  "permissions": [
    "proxy",
    "webNavigation"
  ],
  "version": "0.43resigned1"
}