Examine source code of Keyword Color Marker

{
  "browser_specific_settings": {
    "gecko": {
      "id": "{352ecbb0-3ec0-93b5-a106-9eb1308e3283}",
      "strict_min_version": "112.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ],
        "collects_data": false
      }
    }
  },
  "background": {
    "scripts": [
      "js/background.js"
    ]
  },
  "browser_action": {
    "browser_style": true,
    "default_icon": "img/highlighter.svg",
    "default_popup": "static/popup.html",
    "default_title": "__MSG_extensionName__"
  },
  "content_scripts": [
    {
      "css": [
        "css/content.css"
      ],
      "js": [
        "js/content.js"
      ],
      "matches": [
        "http://*/*",
        "https://*/*"
      ],
      "run_at": "document_end"
    }
  ],
  "description": "__MSG_extensionDescription__",
  "icons": {
    "16": "img/highlighter.svg",
    "19": "img/highlighter.svg",
    "24": "img/highlighter.svg",
    "32": "img/highlighter.svg",
    "38": "img/highlighter.svg",
    "48": "img/highlighter.svg",
    "64": "img/highlighter.svg",
    "72": "img/highlighter.svg",
    "96": "img/highlighter.svg",
    "128": "img/highlighter.svg",
    "256": "img/highlighter.svg"
  },
  "manifest_version": 2,
  "name": "__MSG_extensionName__",
  "permissions": [
    "tabs"
  ],
  "short_name": "__MSG_extensionName__",
  "version": "1.1.1resigned1"
}