Examine source code of Salesforce Credentials

{
  "manifest_version": 2,
  "name": "Salesforce Credentials",
  "description": "Manage your Salesforce Credentials and login with one click.",
  "version": "1.4.3",
  "browser_action": {
    "default_icon": "icons/logo/icon48.png",
    "default_title": "Salesforce Credentials",
    "default_popup": "popup.html"
  },
  "icons": {
    "16": "icons/logo/icon16.png",
    "48": "icons/logo/icon48.png",
    "128": "icons/logo/icon128.png"
  },
  "content_scripts": [
    {
      "run_at": "document_end",
      "matches": [
        "https://*.salesforce.com/*",
        "https://*.force.com/*",
        "https://*.visualforce.com/*"
      ],
      "js": [
        "js/utils.js",
        "js/setTabs.js"
      ]
    },
    {
      "matches": [
        "https://*.salesforce.com/*",
        "https://*.force.com/*",
        "https://*.visualforce.com/*"
      ],
      "js": [
        "js/loginHelper.js"
      ]
    }
  ],
  "web_accessible_resources": [
    "addCredentialPopup.html"
  ],
  "omnibox": {
    "keyword": "sf"
  },
  "background": {
    "scripts": [
      "js/utils.js",
      "js/background.build.js"
    ],
    "persistent": false
  },
  "permissions": [
    "https://*.salesforce.com/*",
    "https://*.force.com/*",
    "https://*.visualforce.com/*",
    "storage",
    "tabs",
    "downloads",
    "cookies"
  ]
}