Examine source code of Dev Env Marker

{
  "manifest_version": 2,
  "name": "Dev Env Marker",
  "version": "1.1.2",
  "description": "Adds prefix to tabs based on regular expressions.",
  "permissions": [
    "tabs",
    "storage",
    "<all_urls>"
  ],
  "browser_action": {
    "default_icon": "icon.png",
    "default_popup": "popup.html"
  },
  "options_page": "options.html",
  "background": {
    "scripts": [
      "consts.js",
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "envmarker@wawro.eu",
      "strict_min_version": "67.0"
    }
  }
}