Examine source code of DynamicHistory

{
  "manifest_version": 2,
  "applications": {
    "gecko": {
      "id": "@dynamichistory"
    }
  },
  "name": "DynamicHistory",
  "short_name": "DynamicHistory",
  "author": "nulldev",
  "description": "Automagically delete history based on the keywords on the page!",
  "version": "2.18resigned1",
  "options_ui": {
    "page": "options.html",
    "chrome_style": true,
    "browser_style": true
  },
  "permissions": [
    "activeTab",
    "tabs",
    "<all_urls>",
    "history",
    "storage"
  ],
  "icons": {
    "16": "icon16.png",
    "32": "icon32.png",
    "48": "icon48.png",
    "128": "icon128.png"
  },
  "background": {
    "page": "background.html"
  },
  "browser_action": {
    "default_icon": {
      "16": "icon16.png",
      "32": "icon32.png",
      "48": "icon48.png",
      "128": "icon128.png"
    },
    "default_popup": "popup.html"
  },
  "sandbox": {
    "pages": [
      "history_processor_sandbox.html"
    ]
  }
}