Examine source code of Link Previewer For Firefox

{
  "manifest_version": 2,
  "name": "Link Previewer",
  "version": "2.2.3",
  "description": "Preview links in a popup without leaving your current page.",
  "icons": {
    "48": "icons/link-previewer 48x48.png",
    "96": "icons/link-previewer 96x96.png",
    "128": "icons/link-previewer 128x128.png"
  },
  "permissions": [
    "activeTab",
    "storage",
    "webRequest",
    "webRequestBlocking",
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "components/global.js",
        "components/settings.js",
        "components/svg.js",
        "components/history.js",
        "components/parentPage.js",
        "components/popups.js",
        "components/sizing.js",
        "components/focus.js",
        "components/ui.js",
        "content.js"
      ],
      "css": [
        "preview_style.css"
      ],
      "all_frames": false
    },
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "components/shared.js",
        "components/focus.js",
        "content_iframe.js"
      ],
      "all_frames": true
    }
  ],
  "browser_action": {
    "default_icon": "icons/link-previewer 128x128.png",
    "default_title": "Link Previewer Settings",
    "default_popup": "options/options.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "link-previewer@example.com"
    }
  }
}