Examine source code of WebMemex

{
  "name": "WebMemex",
  "version": "0.3.3",
  "icons": {
    "48": "assets/webmemex-48.png",
    "96": "assets/webmemex-96.png"
  },
  "options_ui": {
    "page": "options.html",
    "browser_style": true,
    "chrome_style": true
  },
  "background": {
    "scripts": [
      "lib/browser-polyfill.js",
      "main/background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "lib/browser-polyfill.js",
        "main/content_script.js"
      ],
      "run_at": "document_start"
    }
  ],
  "browser_action": {
    "default_icon": "assets/webmemex-32.png",
    "default_title": "WebMemex",
    "default_popup": "/popup.html"
  },
  "commands": {
    "openOverview": {
      "suggested_key": {
        "default": "Ctrl+Y"
      },
      "description": "Open memory overview"
    },
    "_execute_browser_action": {
      "suggested_key": {
        "default": "Alt+M"
      },
      "description": "Store this page"
    }
  },
  "applications": {
    "gecko": {
      "id": "{37e031df-9c74-412e-b933-e847443ad005}"
    }
  },
  "permissions": [
    "<all_urls>",
    "contextMenus",
    "downloads",
    "history",
    "notifications",
    "storage",
    "tabs",
    "unlimitedStorage",
    "webNavigation"
  ],
  "manifest_version": 2
}