Examine source code of Context

{
  "manifest_version": 2,
  "name": "Context",
  "description": "Popup Wikipedia",
  "version": "1.3",
  "homepage_url": "https://github.com/mauforonda/context",
  "applications": {
    "gecko": {
      "id": "askwikipedia@mauforonda"
    }
  },
  "icons": {
    "48": "src/icons/icon.svg",
    "96": "src/icons/icon.svg"
  },
  "browser_action": {
    "default_title": "Context",
    "default_popup": "src/panel/panel.html",
    "default_icon": "src/icons/icon.svg"
  },
  "background": {
    "scripts": [
      "src/background/background.js"
    ]
  },
  "commands": {
    "_execute_browser_action": {
      "suggested_key": {
        "default": "Alt+Z"
      },
      "description": "Context"
    }
  },
  "options_ui": {
    "page": "src/options/options.html"
  },
  "permissions": [
    "activeTab",
    "<all_urls>",
    "storage",
    "theme"
  ]
}