Firefox Developer Edition Features
Firefox Developer Edition has all the latest developer tools that have reached beta. We also add some extra features for developers that are only available in this channel. It uses its own path and profile, so that you can run it alongside Release or Beta Firefox. Check the tools awesome tools FireFox has in its collection of developer tools in this in-depth look at Firefox Developer tools you should know about.Find ou.
Firefox Developer Tools is a set of web developer tools built into Firefox. You can use them to examine, edit, and debug HTML, CSS, and JavaScript.
This section contains detailed guides to all of the tools as well as information on how to debug Firefox for Android, how to extend DevTools, and how to debug the browser as a whole.
Firefox For Developer
Houdahspot. If you have any feedback on DevTools or want to contribute to the project, you can join the DevTools community.
Note: If you are just getting started with web development and using developer tools, our learning docs will help you — see Getting started with the Web and What are browser developer tools? for good starting points.
The Core Tools
You can open the Firefox Developer Tools from the menu by selecting Tools > Web Developer > Toggle Tools or use the keyboard shortcut Ctrl + Shift + I or F12 on Windows and Linux, or Cmd + Opt + I on macOS.
The ellipsis menu on the right-hand side of Developer Tools contains several commands that let you perform actions or change tool settings.
What Is Firefox Developer Edition
| This button only appears when there are multiple iframes on a page. Click it to display a list of the iframes on the current page and select the one with which you want to work. |
| Click this button to take a screenshot of the current page. (Note: This feature is not turned on by default and must be enabled in settings before the icon will appear.) |
| Toggles Responsive Design Mode. |
| Opens the menu that includes docking options, the ability to show or hide the split console, and Developer Tools settings. The menu also includes links to the documentation for Firefox Web Tools and the Mozilla Community. |
| Closes the Developer Tools |
Page Inspector
View and edit page content and layout. Visualize many aspects of the page including the box model, animations, and grid layouts.
Web Console
See messages logged by a web page and interact with the page using JavaScript.
JavaScript Debugger
Stop, step through, examine, and modify the JavaScript running on a page.
Network Monitor
See the network requests made when a page is loaded.
Performance Tools
Analyze your site's general responsiveness, JavaScript, and layout performance.
Responsive Design Mode
See how your website or app will look and behave on different devices and network types.
Accessibility inspector
Provides a means to access the page's accessibility tree, allowing you to check what's missing or otherwise needs attention. Reigns: game of thrones.
Application panel
Provides tools for inspecting and debugging modern web apps (also known as Progressive Web Apps). How to make an old fashioned. This includes inspection of service workers and web app manifests.
Note: The collective term for the UI inside which the DevTools all live is the Toolbox.
More Tools
These developer tools are also built into Firefox. Unlike the 'Core Tools' above, you might not use them every day.
- Memory
- Figure out which objects are keeping memory in use.
- Storage Inspector
- Inspect cookies, local storage, indexedDB, and session storage present in a page.
- DOM Property Viewer
- Inspect the page's DOM properties, functions, etc.
- Eyedropper
- Select a color from the page.
- Style Editor
- View and edit CSS styles for the current page.
- Taking screenshots
- Take a screenshot of the entire page or of a single element.
- Measure a portion of the page
- Measure a specific area of a web page.
- Rulers
- Overlay horizontal and vertical rulers on a web page
For the latest developer tools and features, try Firefox Developer Edition.
Connecting the Developer Tools
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.
- about:debugging
- Debug add-ons, content tabs, and workers running in the browser.
- Connecting to Firefox for Android
- Connect the developer tools to an instance of Firefox running on an Android device.
- Connecting to iframes
- Connect the developer tools to a specific iframe in the current page.
- Connecting to other browsers
- Connect the developer tools to Chrome on Android and Safari on iOS.
Debugging the browser
By default, the developer tools are attached to a web page or web app. But you can also connect them to the browser as a whole. This is useful for browser and add-on development.
- Browser Console
- See messages logged by the browser itself and by add-ons, and run JavaScript code in the browser's scope.
- Browser Toolbox
- Attach the Developer Tools to the browser itself.
Extending DevTools
For information on extending the Firefox DevTools, see Extending the developer tools over in the Browser Extensions section of MDN.
Migrating from Firebug
Firebug has come to the end of its lifespan (see Firebug lives on in Firefox DevTools for details of why), and we appreciate that some people will find migrating to another less familiar set of DevTools to be challenging. To ease a transition from Firebug to the Firefox developer tools, we have written a handy guide — Migrating from Firebug.
Contribute
If you want to help improve the developer tools, these resources will get you started.
- Get Involved
- Our community website explains how to get involved.
- bugs.firefox-dev.tools
- A tool helping to find bugs to work on.
Formerly known as Firefox Quantum, Firefox Developer Edition is a specialized web browser built especially for web developers. Some of these tools and features eventually do make their way into the main Mozilla Firefox web browser.
Stepping aside from the main development branch of Firefox, Firefox Developer offers a number of features that are currently not present in Firefox, namely beta features and tools for web development.
The look and feel of Firefox Developer Edition is slightly different from the main release, but it's nothing to get too excited about; it's mainly just the color scheme.
In terms of tools, Developer Edition provides a WebIDE, Browser Console, Responsive Design Mode, Eyedropper, Scratchpad (for JavaScript debugging) and Service Workers. These tools can be handle for testing web applications.
Like the main branch of Firefox, this version also includes the main development tools like the Inspector, Console, Debugger, Style Editor, Performance tab, Memory, Network, Storage and Accessibility.
Firefox Developer Edition 89.0b3 on 32-bit and 64-bit PCs
This download is licensed as freeware for the Windows (32-bit and 64-bit) operating system on a laptop or desktop PC from web browsers without restrictions. Firefox Developer Edition 89.0b3 is available to all software users as a free download for Windows. As an open source project, you are free to view the source code and distribute this software application freely.
The program was created by the developer as a freeware product, but donations for the continued development are highly appreciated. You may generally make a donation via the developer's main web site.
Firefox Developer Edition Features Cheat
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