Examine source code of Crewser Radar

{
  "manifest_version": 2,
  "name": "Crewser-extension",
  "version": "1.4",
  "description": "Trouvez des offres freelance et gagnez 2 % si elles sont signées.",
  "permissions": [
    "tabs"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "icons": {
    "128": "icons/crewser-logo-128.png"
  },
  "browser_action": {
    "default_title": "Crewser Extension",
    "default_icon": "icons/crewser-logo-128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{a63b8745-3afa-40df-8113-803c73147211}"
    }
  }
}