Examine source code of Vim What?

{
  "manifest_version": 2,
  "name": "Vim What?",
  "description": "Visual Vim reference: color-coded keyboard, prefix overlays, progressive lessons, plugin tips, and progress tracking.",
  "version": "2026.6.13.1",
  "icons": {
    "16": "vim-what-16.png",
    "48": "vim-what-48.png",
    "128": "vim-what-128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "vim-what@whiteboardworks.com",
      "strict_min_version": "142.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    },
    "gecko_android": {
      "strict_min_version": "142.0"
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_title": "Vim What?",
    "default_popup": "popup.html"
  }
}