Release notes

Firefox 53

• See React event listeners in the Inspector.
• Copy screenshots to the clipboard.
• JSON Viewer is enabled in Firefox Beta and Release versions.

All devtools bugs fixed between Firefox 52 and Firefox 53.

Firefox 52

• Completely revamped Responsive Design Mode, including UA selection and network throttling.
• New JavaScript Debugger, including a redesigned UI.
• The Animation Inspector now displays timing functions.
• The Page Inspector now includes a CSS grid highlighter.
• about:debugging now shows service worker state.
• The Page Inspector includes an easy way to highlight the selected element.
• The Page Inspector displays whitespace-only text nodes.

All devtools bugs fixed between Firefox 51 and Firefox 52.

Firefox 51

• Network Monitor now shows a "Blocked" state for network requests.

All devtools bugs fixed between Firefox 50 and Firefox 51.

Firefox 50

• The Web Console now understands source maps.
• The Storage Inspector now lets you delete items from IndexedDB object stores.
• The Memory tool is enabled by default.
• The Box model view is moved into the Computed view.
• The Web Console now displays stack traces for XHR or Fetch() network requests.

All devtools bugs fixed between Firefox 49 and Firefox 50.

Firefox 49

• JavaScript errors logged in the console now link to MDN help pages.
• The Animation Inspector now shows performance information.
• The Inspector's context menu has been reorganized.
• The Network Monitor now shows the cause of each network request.
• The Storage Inspector lets you delete IndexedDB databases.
• about:debugging now has a new Tabs page, to debug any open tab.

All devtools bugs fixed between Firefox 48 and Firefox 49.

Firefox 48

Highlights:

• Edit stored items in the Storage Inspector
• Memory tool treemap view
• Reposition elements by dragging them around the page
• See HTTP request details in the Web Console
• Animation inspector updates for Web Animations API
• Firebug theme
• DOM Property Viewer

All devtools bugs fixed between Firefox 47 and Firefox 48.

Firefox 47

Highlights:

• Debug registered Service Workers
• Cache storage is now visible in the Storage Inspector
• Dominators view shows retaining paths
• Prevent panels from hiding automatically, to aid browser and add-on debugging
• 3D view (Tilt) has been removed
• Set a custom User Agent string in Responsive Design Mode
• Font Inspector is now disabled by default
• Console detects incomplete input and switches to multiline mode
• Devtools Reload lets you hack the devtools without rebuilding Firefox

All devtools bugs fixed between Firefox 46 and Firefox 47.

Firefox 46

Highlights:

• Dominators view in the Memory tool
• Allocations view in the Performance tool
• One click to apply @media rule conditions in the Style Editor

All devtools bugs fixed between Firefox 45 and Firefox 46.

Firefox 45

Highlights:

• Full-text search in the Page Inspector
• Heap snapshot diffing in the Memory tool
• DomContentLoaded and load events shown in the Network Monitor
• Animation inspector improvements

All devtools bugs fixed between Firefox 44 and Firefox 45.

Firefox 44

Highlights:

• Memory tool
• Animation inspector improvements
• New Waterfall markers: DomContentLoaded, load, worker messages

All devtools bugs fixed between Firefox 43 and Firefox 44.

Firefox 43

Highlights:

• New animation inspector UI
• Server logging in the Web Console
• Quickly find the rule that overrode a CSS declaration
• "Use in Console" context menu item in Inspector
• "Strict" option for filtering in the Rules view
• Network entries in the Console now link to the Network Monitor
• New sidebar UI for WebIDE

All devtools bugs fixed between Firefox 42 and Firefox 43.

Firefox 42

Highlights:

• Debugging Firefox for Android over Wifi
• Firefox OS Simulator configuration in WebIDE
• CSS filter presets

All devtools bugs fixed between Firefox 41 and Firefox 42.

Firefox 41

Highlights:

• Take a screenshot of a DOM node
• Copy as HAR/save as HAR
• "Add Rule" button in the Rules view
• View source in a tab
• More options to copy CSS rules
• Copy image as data: URI in the Rules view

All devtools bugs fixed between Firefox 40 and Firefox 41. Note that many of these bugs, especially those relating to the performance tools, were uplifted to Firefox 40.

Firefox 40

Highlights:

• Improvements to the Animations view
• Get help from MDN for CSS property syntax
• Edit filters in the Page Inspector
• Web Console now shows messages from workers
• Filter requests by URL in the Network Monitor
• Many new context menu options in the Network Monitor
• Show when network resources are fetched from the browser cache
• Filter rules in the Page Inspector

More:

• Break at debugger; statements in unnamed eval sources
• Copy URL/Open in New Tab context menu items for Debugger source list pane
• console.dirxml support in the Web Console
• Style Editor: "Open Link In New Tab" item added to stylesheet list
• Inspector selector search now includes class/id results even without css prefix
• Tooltips in box-model view saying which CSS rule caused the value
• Switch between color unit format in the Inspector using Shift+click
• Implement "Scroll Into View" menu item for the Inspector
• Linkify url/id/resource attributes in the Inspector
• IP address tooltip in the Network Monitor

Everything: all devtools bugs fixed between Firefox 39 and Firefox 40.

Firefox 39

Highlights:

• WebIDE now supports debugging Firefox OS devices over Wi-Fi
• WebIDE now supports Cordova projects
• Animations view: rewind, fast-forward, and jump to a specific time
• The cubic Bézier curve editor now includes 31 presets
• Drag and drop elements in the Page Inspector
• Web console command history is now persisted across sessions
• $_ console command to print the last result evaluated
• Better box model highlighting for inline elements

All devtools bugs fixed between Firefox 38 and Firefox 39.

Firefox 38

Highlights:

• Bypass audio nodes in Web Audio Editor
• "copy" command in Web Console
• Highlight and filter XmlHttpRequests in Web Console
• See optimized-out variables in the Debugger
• See security warnings in the Network Monitor
• See transferred sizes in the Network Monitor
• Play/pause all animations in the page

All devtools bugs fixed between Firefox 37 and Firefox 38.

Firefox 37

Highlights:

• Security panel in the Network Monitor
• Animations panel in the Page Inspector
• Support for running a custom build step in WebIDE

All devtools bugs fixed between Firefox 36 and Firefox 37.

Firefox 36

Highlights:

• eval sources now appear in the Debugger
• Simpler process for connecting to Firefox for Android
• Box Model Highlighter works on remote targets
• "Invert the call tree" option in the Profiler
• Inspect DOM promises in the console
• Extra "Paste" commands in the Inspector

All devtools bugs fixed between Firefox 35 and Firefox 36.

Firefox 35

Highlights:

• See ::before and ::after pseudo elements in the Page Inspector
• CSS source maps are now enabled by default
• "Show DOM Properties" from the Page Inspector

All devtools bugs fixed between Firefox 34 and Firefox 35.

Firefox 34

Highlights:

• Storage Inspector: a new tool enabling you to view data stored by web pages
• Performance tool: revamped Profiler UI and frame rate timeline
• Frame switching: point the developer tools at a specific iframe in the page
• console.table support
• jQuery events are visible in the Page Inspector

All devtools bugs fixed between Firefox 33 and Firefox 34.

Firefox 33

Highlights:

• WebIDE: a new environment for developing and debugging web apps
• You can edit animation @keyframes and timing functions
• Event listeners are now visible in the Inspector
• There's a sidebar listing @media rules in the Style Editor
• You can add new CSS rules and edit selectors in the Inspector
• There are three new developer toolbar commands: folder, highlight, and inject

More details:

• The Disable Cache setting now persists when the devtools are reopened
• transform visualization is now shown in the page, not a tooltip
• Preferences for the source editor are exposed in the Settings page
• The viewport size is directly editable in Responsive Design View
• The Debugger now automatically black boxes source files with a "min.js" extension

All devtools bugs fixed between Firefox 32 and Firefox 33.

Firefox 32

Highlights:

• Web Audio Editor
• Code completion and inline documentation in Scratchpad
• User agent styles in the Inspector's Rules view
• Element picker button has moved
• Node dimensions added to the Inspector's infobar
• Full page screenshot button added

More details:

• HiDPI images added to the tools
• Nodes that have display:none are shown differently in the Inspector

All devtools bugs fixed between Firefox 31 and Firefox 32.

Firefox 31

Highlights:

• Eyedropper tool to select colors in web pages
• full stack traces for console error messages
• editable Box Model View
• %c formatting to style console messages
• "copy as cURL" command in Network Monitor
• Sublime Text keybindings in the source editor

More details:

• Option to make Network Monitor logs persistent
• JavaScript warnings on by default in the Web Console
• Alt+click to expand all descendants of a node

All devtools bugs fixed between Firefox 30 and Firefox 31.

Firefox 30

Highlights:

• Box model highlighting in the Page Inspector
• Web Console support for executing JS in frames
• Web Console display improvements: code highlighting, node highlighting and inspection
• Network Monitor theme improvements, image thumbnails, image preview, HTML preview
• Browser Console input must now be enabled in Settings
• Icons for Scratchpad and other tools now hidden by default

More details:

• Support for console.count()
• New shortcut key to focus on web console command line
• Font family tooltip in the Inspector
• Firefox OS HUD features: memory tracking and jank monitor

All devtools bugs fixed between Firefox 29 and Firefox 30.

Firefox 29

Firefox 29 Hacks post. Highlights:

• Theme improvements, including major updates to the light theme
• Network Monitor performance analysis tool
• CSS source maps
• Changes in the way node selection works in the Inspector
• Classic call stack for the Debugger, and added the ability to highlight and inspect nodes
• Emacs and Vim keybindings in the source editor

Firefox 28

Firefox 28 Hacks post. Highlights:

• The App Manager has an integrated manifest editor
• The Split Console feature enables you to use the Web Console and another developer tool side by side
• Pretty-print minified JavaScript in the Debugger
• Color picker tooltip in the Inspector
• Browser Toolbox for debugging platform or add-on code

Firefox 27

Firefox 27 Hacks post. Highlights:

• The Shader Editor lets you view and edit WebGL shaders
• Instruct the debugger to break on DOM events to which you're listening
• Edit HTML in the Inspector
• See color swatches and background images in the Inspector's Rules view
• The Web Console now logs reflow events
• CodeMirror is now used as the source editor in many tools