All of the selected item's pre-set attributes are shown along with their current values. Double-click a value in the grid to modify it. In addition, you may add attributes and their values to try them out. For example, with the above selection still active click the plus icon. You should see the following:. Choose the background-color from the combo box, then type "orange" in the value column then hit the enter key. Notice that the search input box turns orange.
The following dialog box appears:. Right-click a node in the tree-view to get the following options:. These options allow you to view source of selected element with or without a style that it uses. Visualize many aspects of the page including the box model, animations, and grid layouts. Provides a means to access the page's accessibility tree, allowing you to check what's missing or otherwise needs attention.
Provides tools for inspecting and debugging modern web apps also known as Progressive Web Apps. This includes inspection of service workers and web app manifests. These developer tools are also built into Firefox. Unlike the "Core Tools" above, you might not use them every day. For the latest developer tools and features, try Firefox Developer Edition.
Download Firefox Developer Edition. If you open the developer tools using keyboard shortcuts or the equivalent menu items, they'll target the document hosted by the currently active tab.
But you can attach the tools to a variety of other targets, too, both within the current browser and in different browsers or even different devices. By default, the developer tools are attached to a web page or web app. If an app uses a logo image it should strongly consider omitting a title and subtitle. One or more custom views.
The application may add arbitrary child views to the Toolbar. They will appear at this position within the layout. If a child view's Toolbar. An action menu. The menu of actions will pin to the end of the Toolbar offering a few frequent, important or typical actions along with an optional overflow menu for additional actions.
Action buttons are vertically aligned within the Toolbar's minimum height, if set. Host a site on a development machine web server, and then access the content from an Android device. Learn how to use Chrome and DevTools to find memory issues that affect page performance, including memory leaks, memory bloat, and frequent garbage collections.
This section describes common terms used in memory analysis, and is applicable to a variety of memory profiling tools for different languages. Learn how to record heap snapshots with the Chrome DevTools heap profiler and find memory leaks. Use the allocation profiler tool to find objects that aren't being properly garbage collected, and continue to retain memory. Record, replay and measure user flows. Record, replay and measure user flows with the Recorder panel.
View and debug media players information. Use the Media Panel to view information and debug the media players per browser tab.
Emulate authenticators and debug WebAuthn. Edit files with Workspaces. Learn how to save changes made within DevTools to disk. Debug Progressive Web Apps. Use the Application panel to inspect, modify, and debug web app manifests, service workers, and service worker caches. Understand security issues. Keyboard shortcuts. The canonical documentation for Chrome DevTools keyboard shortcuts.
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