Examine source code of dpass

{
  "author": "Diggory Blake",
  "description": "Diggsey's Password Manager",
  "name": "dpass",
  "version": "0.3.0",
  "icons": {
    "48": "icons/icon-48.png"
  },
  "options_ui": {
    "page": "src/entries/options/index.html",
    "open_in_tab": true,
    "chrome_style": false
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "dpass@diggsey.com"
    }
  },
  "commands": {
    "dpass-configure": {
      "description": "Open the dpass options page"
    },
    "dpass-sync": {
      "description": "Trigger an immediate dpass sync"
    },
    "_execute_browser_action": {
      "suggested_key": {
        "default": "Ctrl+Space"
      }
    }
  },
  "background": {
    "persistent": true,
    "page": "background.html"
  },
  "browser_action": {
    "default_icon": {
      "48": "icons/icon-48.png"
    },
    "default_title": "Auto-fill using dpass",
    "default_area": "navbar"
  },
  "permissions": [
    "activeTab",
    "scripting",
    "storage",
    "identity",
    "contextMenus",
    "downloads",
    "webNavigation",
    "https://www.googleapis.com/*"
  ],
  "manifest_version": 2,
  "web_accessible_resources": [
    "assets/_commonjsHelpers-725317a4.js",
    "assets/autofill-b4ca3fbc.js",
    "assets/browser-polyfill-a32979e0.js",
    "assets/src/entries/content/main-10f76c76.js",
    "src/entries/autofillEmbed/index.html",
    "src/entries/content/main.js",
    "src/entries/noActionPopup/index.html",
    "src/entries/unlockPopup/index.html"
  ]
}