Examine source code of Font Finder Lite

{
  "manifest_version": 2,
  "name": "Font Finder Lite",
  "version": "1.0",
  "description": "Hover over text to see its font, size, color, and style.",
  "permissions": [
    "activeTab"
  ],
  "icons": {
    "64": "icon.png"
  },
  "browser_action": {
    "default_icon": "icon.png",
    "default_title": "Font Finder Lite",
    "default_popup": "popup.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{c79567dd-fed5-4665-a22a-c4d7fd53d2c6}",
      "strict_min_version": "58.0"
    },
    "content_scripts": [
      {
        "matches": [
          "<all_urls>"
        ],
        "js": [
          "content.js"
        ]
      }
    ]
  }
}