Examine source code of LaBonneCarte

{
  "icons": {
    "16": "icon16.plasmo.e7bcd3ac.png",
    "32": "icon32.plasmo.ce39377b.png",
    "48": "icon48.plasmo.3c17e113.png",
    "64": "icon64.plasmo.df317abe.png",
    "128": "icon128.plasmo.6a4310c5.png"
  },
  "manifest_version": 2,
  "browser_action": {
    "default_icon": {
      "16": "icon16.plasmo.e7bcd3ac.png",
      "32": "icon32.plasmo.ce39377b.png",
      "48": "icon48.plasmo.3c17e113.png",
      "64": "icon64.plasmo.df317abe.png",
      "128": "icon128.plasmo.6a4310c5.png"
    },
    "default_popup": "popup.html"
  },
  "version": "4.2.1",
  "author": "Yoam Farges <yoam.farges@gmail.com>",
  "name": "Labonnecarte",
  "description": "Affiche les résultats de vos recherches leboncoin sur une carte.",
  "permissions": [
    "*://*.leboncoin.fr/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "*://*.leboncoin.fr/*"
      ],
      "js": [
        "content.e81cace7.js"
      ],
      "all_frames": true,
      "css": [
        "content.f3dd3289.css"
      ]
    }
  ],
  "web_accessible_resources": [
    "assets/*.png",
    "assets/*.jpg",
    "assets/*.svg",
    "marker-icon-2x.e6f49f89.png",
    "marker-icon.ffd5139b.png",
    "marker-shadow.e943c92c.png",
    "content.c69c3914.css",
    "layers.70850017.png",
    "layers-2x.2d6ef34d.png",
    "marker-icon.2969b5de.png",
    "content.147e05f8.css",
    "content.1f2d50aa.css"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{9398a978-34ec-4269-a77f-74e1c4b9c893}"
    }
  }
}