Stylite

manifest.json

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "manifest_version": 2,
  "name": "Stylite",
  "description": "Quickly customize styling on any website",
  "version": "0.3.0",
  "icons": {
    "128": "icon128x128.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "run_at": "document_start",
      "match_about_blank": true,
      "js": [
        "content.js"
      ]
    }
  ],
  "browser_action": {
    "default_icon": "icon19x19.png",
    "default_popup": "popup.html"
  },
  "permissions": [
    "activeTab",
    "tabs",
    "<all_urls>",
    "storage",
    "unlimitedStorage"
  ]
}