Waterfox 40.0.2 is now available to download for Windows & Mac.

This is a very stable build of Waterfox and should fix previous JavaScript instabilities and crashes.

What’s new in Waterfox 40.0.2?

  • Implemented the patch for Bug 1171966 that fixes slow animations in Firefox since 38
  • New logo!
  • Fixed an issue that hid the Refresh Waterfox button in about:support
  • JavaScript stability should be much better than previous versions as I’ve managed to build properly with the new unified build system.


  • Some YouTube videos buffer indefinitely

What’s new in Firefox 40.0.2?


  • Support for Windows 10
  • Enabled API allowing Windows 10 users to open settings dialog
  • Added protection against unwanted software downloads
  • User can receive suggested tiles in the new tab page based on categories Firefox matches to browsing history (en-US only).
  • Hello allows adding a link to conversations to provide context on what the conversation will be about
  • New style for add-on manager based on the in-content preferences style
  • Improved scrolling, graphics, and video playback performance with off main thread compositing (GNU/Linux only)
  • Graphic blocklist mechanism improved: Firefox version ranges can be specified, limiting the number of devices blocked


  • Add-on extensions that are not signed by Mozilla will display a warning
  • NPAPI Plug-in performance improved via asynchronous initialization
  • Smoother animation and scrolling with hardware vsync (Windows only)
  • JPEG images use less memory when scaled and can be painted faster
  • Sub-resources can no longer request HTTP authentication, thus protecting users from inadvertently disclosing login data


  • IndexedDB transactions are now non-durable by default
  • Implemented AudioBufferSourceNode.detune to modulate playback rate in cents, a logarithmic unit of measure used for musical intervals


  • Improved Performance tools in the developer tools: Waterfall view, Call Tree view and a Flame Chart view
  • New rules view tooltip in the Inspector to tweak CSS Filter values
  • Console API messages from SharedWorker and ServiceWorker are now displayed in web console
  • New page ruler highlighting tool that displays lightweight horizontal and vertical rules on a page
  • Inspector now searches across all content frames in a page


  • Kannada text does not display properly in built-in pdf viewer
  • mozalloc.lib was missing from the xulrunner package
  • Fix a startup crash with some combination of hardware and drivers
  • Various security fixes