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Read about new Firefox features and ways to stay safe online. Get the details on the latest Firefox updates. View all Firefox Browsers. Close Products menu. Firefox Monitor. See if your email has appeared in a company’s data breach. Facebook Container. I find it odd that input type='date' is still not supported in Firefox after all of this time. In fact, I don't think they added in much (if any) of the HTML 5 new types on an input element.
HTML5 Toggle Extension for Firefox is a free download, works with Firefox 4.0b8 – 4.0b11. Learn more about HTML 5 features of Firefox In the following video,a developer from Firefox team briefly explains how HTML5 apps, games and videos are expected to work inside Firefox 3.5. Firefox options, preferences and settings. The Options/Preferences panels give you access to Firefox settings. This article describes what types of settings are available in each panel. Mozilla Firefox is an open-source web browser developed by Mozilla. Firefox is available for Windows, macOS, Linux, and Android. Firefox has been the second most popular web browser since January, 2018. Firefox uses the Gecko rendering engine. Download Firefox.
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.
If you have any feedback on DevTools or want to contribute to the project, you can join the DevTools community.
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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.
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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.
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| 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.
Application panel
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.
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
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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.
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This article explains how to export your bookmarks to an HTML file, which can be used as a backup or for importing into another web browser.
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- For instructions specific to these other browsers, see Export bookmarks to Internet Explorer, Export bookmarks to Opera and Export bookmarks to Safari.
Click the Library button on your toolbar. (If you don't see it there, click the menu button then click Library.) Click Bookmarks and then click the Show All BookmarksManage Bookmarks bar at the bottom.
- From the toolbar on the Library window, click the Import and Backup button
and choose Export Bookmarks to HTML… from the drop-down menu. - In the Export Bookmarks File window that opens, choose a location to save the file, which is named bookmarks.html by default. The desktop is usually a good spot, but any place that is easy to remember will work.
- Click the button. The Export Bookmarks File window will close.
- Close the Library window.
Your bookmarks are now successfully exported from Firefox. The bookmarks HTML file you saved is now ready to be imported into another web browser.