Examine source code of Elpass

{
  "name": "Elpass",
  "description": "The extension for Elpass, a modern password manager you can fully control.",
  "version": "2.1.2",
  "manifest_version": 2,
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "all_frames": true,
      "js": [
        "contentScripts.js"
      ],
      "css": [
        "style.css"
      ],
      "matches": [
        "http://*/*",
        "https://*/*"
      ],
      "run_at": "document_start",
      "exclude_globs": [
        "*://ad.*/*",
        "*://ad0.*/*",
        "*://ad1.*/*",
        "*://ad2.*/*",
        "*://ad3.*/*",
        "*://ad4.*/*",
        "*://ad5.*/*",
        "*://ad6.*/*",
        "*://ad7.*/*",
        "*://ad8.*/*",
        "*://ad9.*/*",
        "*://ads?.*/*",
        "*://adserver*.*/*",
        "*://*/*adframe*",
        "*://tag.admeld*.*/*",
        "*://*.atdmt.com/*",
        "*://*.doubleclick.*/*",
        "*://*.ak.fbcdn.net/*",
        "*://plusone.google.com/*",
        "*://platform.twitter.com/widgets/*",
        "*://*.facebook.com/widgets/*",
        "*://*.facebook.com/plugins/*",
        "*://*.facebook.com/extern/*",
        "*://www.youtube.com/embed/*",
        "*://stats.complex.com/*",
        "*://*.addthis.com/static/*",
        "*://vitamine.networldmedia.net/*",
        "*://api.tweetmeme.com/*",
        "*://*.atwola.com/*",
        "*://engine.adzerk.net/*",
        "*://*.stumbleupon.com/badge/*",
        "*://*.bizographics.com/collect/*",
        "*://*.musthird.com/*",
        "*://*.googletagmanager.com/*",
        "*://ipservice.163.com/*"
      ]
    }
  ],
  "browser_action": {
    "default_title": "Fill the password",
    "default_icon": {
      "19": "icon19.png",
      "38": "icon38.png"
    }
  },
  "commands": {
    "show_popup": {
      "suggested_key": {
        "default": "Ctrl+Shift+O",
        "mac": "Command+Shift+O"
      },
      "description": "Open Popup"
    }
  },
  "incognito": "spanning",
  "options_page": "options.html",
  "content_security_policy": "script-src 'self'; object-src 'self'; connect-src 'self' ws://127.0.0.1:* ws://localhost:* http://127.0.0.1:* http://localhost:*",
  "permissions": [
    "contextMenus",
    "webRequest",
    "webRequestBlocking",
    "tabs",
    "storage",
    "http://*/*",
    "https://*/*"
  ],
  "browser_specific_settings": {
    "gecko": {
      "data_collection_permissions": {
        "required": [
          "authenticationInfo",
          "browsingActivity"
        ]
      },
      "id": "{25b110a9-131e-45e2-96f8-f953fd35d1a1}"
    }
  },
  "icons": {
    "16": "icon16.png",
    "48": "icon48.png",
    "128": "icon128.png"
  }
}