BitRef

BitRef will help you view the current balance of any Bitcoin address. Just type: "btc [space or tab] bitcoin_address" in Firefox's address bar. This is the easiest and fastest way to check balance of any Bitcoin address.

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manifest.json

{
  "manifest_version": 2,
  "name": "BitRef",
  "version": "1.1resigned1",
  "applications": {
    "gecko": {
      "id": "[email protected]"
    }
  },
  "description": "Check Bitcoin Address Balance Tool",
  "icons": {
    "16": "icon16.png",
    "48": "icon48.png",
    "128": "icon128.png"
  },
  "background": {
    "scripts": [
      "bitref.js"
    ]
  },
  "omnibox": {
    "keyword": "btc"
  },
  "permissions": [
    "https://bitref.com/*"
  ],
  "homepage_url": "https://bitref.com/"
}