Site Inspector - User Manual
The context-sensitive menu does not show up
The context-sensitive menu is what appears when you click on an open browser window with your secondary (right) mouse button. There are some webpages that explicitly disable the context menu. If no context shows up after you click on an open browser window with your secondary mouse button, you can still access Site Inspector functionality on that webpage through the toolbar buttons.
What is Site Inspector?
Site Inspector is a powerful HTTP-client/server test application designed to pinpoint critical performance issues in your web site or web server that may prevent optimal experience for your site's visitors.