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:noneare 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