The Network Monitor shows you all the HTTP requests Firefox makes (for example, when it loads a page, or due to XMLHttpRequests), how long each request takes, and details of each request.
Opening the Network MonitorThere are a few different ways to open the Network Monitor:
Press Ctrl + Shift + E (Cmd + Opt + E on a Mac).
Select the Network panel in the Web Developer Tools, accessible from the Browser Tools submenu
Click the wrench icon , which is in the main toolbar or under the Hamburger menu , then select “Network”.
The Network Monitor will appear at the bottom of the browser window. When it first opens, the Network Monitor does not show request information. The just opened tool looks like this:
Either action causes the Network Monitor to begin monitoring network activity. Once the tool is monitoring network requests, the display looks like this:
When it is actively monitoring activity, the Network Monitor records network requests any time the Toolbox is open, even if the Network Monitor itself is not selected. This means you can start debugging a page in, for example, the Web Console, then switch to the Network Monitor to see network activity without having to reload the page.
UI overviewThe UI is divided into four main pieces:
The main screen contains the toolbar, the network request list, and the network request details pane:
The performance analysis view is a separate screen:
The following articles cover different aspects of using the network monitdor:
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