Examine source code of FiddlerFox

{
  "manifest_version": 2,
  "name": "FiddlerFox",
  "version": "1.0",
  "description": "Allows you to point Firefox to your fiddler instance if it doesn't refresh the proxy settings after Fiddler has started.",
  "icons": {
    "48": "icons/ext.svg",
    "96": "icons/ext.svg"
  },
  "author": "Sebastiaan Dammann [damsteen.nl]",
  "browser_action": {
    "default_icon": {
      "48": "icons/ext.svg",
      "96": "icons/ext.svg"
    },
    "default_title": "Toggle redirection to Fiddler proxy"
  },
  "developer": {
    "name": "Sebastiaan Dammann",
    "url": "https://damsteen.nl"
  },
  "homepage_url": "https://github.com/Sebazzz/fiddlerfox",
  "incognito": "spanning",
  "permissions": [
    "proxy",
    "*://*/*",
    "webRequest",
    "storage"
  ],
  "background": {
    "scripts": [
      "main.js"
    ]
  },
  "options_ui": {
    "page": "options/options.html",
    "browser_style": true
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{eb94cc07-cb60-4116-a52a-05391ffa324c}"
    }
  }
}