Examine source code of TextBlockZoom

{
  "name": "TextBlockZoom",
  "version": "2.1.1",
  "manifest_version": 2,
  "description": "Allows enlarge font size of text blocks and images from context menu.",
  "homepage_url": "https://github.com/vycb/textblockzoom",
  "permissions": [
    "storage",
    "contextMenus",
    "activeTab"
  ],
  "icons": {
    "16": "icons/icon-16.png",
    "32": "icons/icon-32.png",
    "48": "icons/icon-48.png",
    "64": "icons/icon-64.png"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "all_frames": true,
      "js": [
        "contentscript.js"
      ]
    }
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "options_ui": {
    "page": "options.html"
  }
}