Merlin
Center images

Center images

Center images over a dark background (like Firefox)

Merlin
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manifest.json

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "name": "__MSG_appName__",
  "description": "__MSG_appDesc__",
  "default_locale": "en",
  "version": "0.6.3",
  "permissions": [
    "<all_urls>"
  ],
  "icons": {
    "16": "icons/16.png",
    "128": "icons/128.png"
  },
  "offline_enabled": true,
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "css": [
        "main.css"
      ],
      "run_at": "document_start"
    },
    {
      "matches": [
        "*://i.imgur.com/*.gifv",
        "*://i.imgur.com/*.GIFV"
      ],
      "css": [
        "gifv.css"
      ],
      "run_at": "document_start"
    }
  ],
  "manifest_version": 2
}