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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.
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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. Apple shortcut icons.
Zip software for mac. 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.
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. Visualise many aspects of the page including the box model, animations, and grid layouts.
Web Console
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See messages logged by a web page and interact with the page using JavaScript.
Apple Web Development Tools Chrome
JavaScript Debugger
Stop, step through, examine, and modify the JavaScript running in a page.
Network Monitor
See the network requests made when a page is loaded.
Performance Tools
Apple Web Development Tools For Beginners
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.
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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.
Safari is the best way to see the sites on iPhone, iPad, and Mac. Thanks to blazing-fast performance and industry-leading energy efficiency, hundreds of millions of users enjoy exploring the web with Safari. Take advantage of powerful new features, advanced developer tools, and cutting edge technologies in Safari to deliver the best-in class websites and apps.
Apple Pay on the Web
Give customers an easy and secure way to make purchases in Safari 10 or later. Apple Pay allows customers to quickly pay without entering payment, shipping, or contact information on supported websites from their Mac, iPhone, or iPad. Because card numbers aren’t used and every transaction is confirmed with a fingerprint or passcode, Apple Pay is more secure than accepting credit and debit cards.
Picture in Picture
Now users can keep an eye on web video while they multi-task on Mac. Picture in Picture lets users float a video window from Safari over their desktop or full-screen app. Users can play video in any corner of their desktop and resize the window to see more or less of what’s behind it. The window stays put even if they switch desktop spaces. The default HTML5 video player in Safari automatically supports Picture in Picture. And if you use a custom video player, it’s easy to add a Picture in Picture control using the JavaScript presentation mode API.
Safari Extensions on the Mac App Store
The new Extensions category on the Mac App Store showcases Safari extensions, with editorial spotlights and top charts to help users discover and download great extensions from the developer community. Use Xcode to develop your extensions, with the option to get started using App Extension templates, and implement new capabilities using powerful native APIs and familiar web technologies. Xcode 12 supports the popular WebExtension API and includes a porting tool to make it easy to bring your extensions to Safari. And if you’ve already developed an app, you can give users access to your app’s functionality and content, right in Safari.
HTML5 and Legacy Plug-ins on macOS
To deliver faster load times, better battery life, and stronger security, Safari is optimized for HTML5, and will load this content whenever it is available. For websites that use proprietary formats, Safari supports the use of plug-ins such as Flash. In Safari 10, plug-ins are supported for websites where HTML5 is unavailable and may be enabled by users for each individual website. Users can choose to enable plug-ins for one session or every time they visit a specific website. For frequently-visited websites, enabled plug-ins will remain active. For infrequently-visited websites, plug-ins will be disabled.
Content Blockers on macOS
If you previously created Content Blockers for Safari on iOS, you can easily bring them to macOS. You’ll be able to distribute and sell Content Blockers through the Mac App Store. Just like the new Safari Extensions, Xcode makes it easy to create Content Blockers using App Extension templates.
Autoplay and Inline Video on iOS
To help users easily discover your video content, you can now autoplay videos and play them inline with other content on your webpages on all iOS devices. Safari supports autoplay on iOS devices for videos without sound, keeping down the number of distractions on the web.
Web Development Codes
Split View in Safari on iPad
Users can now view two websites at the same time on their iPad using Split View. Responsive Design Mode makes it easy to see how your websites will render in this view — just tap the iPad preview until it turns into a Split View.
Safari Technology Preview
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Download Safari Technology Preview to get a sneak peek at upcoming web technologies in macOS and iOS and experiment with them in your websites and extensions.