Examine source code of GPSDetect

{
  "manifest_version": 2,
  "version": "0.2.4",
  "name": "gps-detect",
  "author": "Allan Wirth",
  "description": "Detects GPS EXIF information in loaded JPEGs automatically",
  "background": {
    "scripts": [
      "buf_util.js",
      "gps.js",
      "util.js",
      "main.js"
    ]
  },
  "browser_action": {
    "browser_style": false,
    "default_icon": "icon-64.png",
    "default_title": "GPSDetect",
    "default_popup": "panel.html"
  },
  "permissions": [
    "webRequest",
    "webRequestBlocking",
    "notifications",
    "http://*/*",
    "https://*/*"
  ],
  "applications": {
    "gecko": {
      "strict_min_version": "57.0"
    }
  }
}