manifest.json

{
  "name": "Fresh Chrome Extension boilerplate",
  "description": "Fully functional, useful bare minimum Google Chrome extension boilerplate [Manifest V3].",
  "homepage_url": "https://github.com/llagerlof/fresh-chrome-extension",
  "version": "3.1.0",
  "manifest_version": 3,
  "action": {
    "default_title": "Fresh Chrome Extension boilerplate 3.1.0",
    "default_popup": "src/popup/popup.html",
    "default_icon": {
      "16": "assets/icons/icon16.png",
      "32": "assets/icons/icon32.png",
      "64": "assets/icons/icon64.png",
      "128": "assets/icons/icon128.png"
    }
  },
  "icons": {
    "16": "assets/icons/icon16.png",
    "32": "assets/icons/icon32.png",
    "64": "assets/icons/icon64.png",
    "128": "assets/icons/icon128.png"
  },
  "content_scripts": [
    {
      "run_at" : "document_start",
      "js": ["src/content/before.js"],
      "matches": [
        "https://*/*",
        "http://*/*"
      ]
    },
    {
      "run_at" : "document_idle",
      "js": ["src/content/after.js"],
      "matches": [
        "https://*/*",
        "http://*/*"
      ]
    }
  ],
  "permissions": [
    "tabs",
    "scripting"
  ],
  "host_permissions": [
    "https://*/*",
    "http://*/*"
  ]
}