Mozilla Firefox is a fast, full-featured Web browser. It offers great security, privacy, and protection against viruses, spyware, malware, and it can also easily block pop-up windows. The key features that have made Mozilla Firefox so popular are the simple and effective UI, browser speed and strong security capabilities. Firefox is built on top of the powerful new Gecko platform, resulting in a safer, easier to use and more personal product.
Firefox includes pop-up blocking, tab-browsing, integrated Google search, simplified privacy controls, a streamlined browser window that shows you more of the page than any other browser and a number of additional features that work with you to help you get the most out of your time online.
Firefox 40.0 changes:
What’s New
- Support for Windows 10
- Added protection against unwanted software downloads
- Suggested Tiles show sites of interest, based on categories from your recent browsing history
- 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
Changed
- Add-on extensions that are not signed by Mozilla will display a warning
- 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
- NPAPI Plug-in performance improved via asynchronous initialization
HTML5
- 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
Developer
- Improved Performance tools in the developer tools: Waterfall view, Call Tree view and a Flame Chart view
- Console API messages from SharedWorker and ServiceWorker are now displayed in web console
- Inspector now searches across all content frames in a page
- New rules view tooltip in the Inspector to tweak CSS Filter values
- New page ruler highlighting tool that displays lightweight horizontal and vertical rules on a page
Fixed
- Kannada text does not display properly in built-in pdf viewer
Known Issues
- If Firefox is restarted from an add-on install notification, on-going private browsing downloads might be canceled without warning (1185294)
Download: Firefox 40.0 for Windows | 40.0 MB (Freeware)
Download: Classic Theme Restorer (Customize Australis)
Download: Firefox 40.0 for Linux | 46.9 MB
Download: Firefox 40.0 for MacOS | 73.8 MB
View: Firefox Home Page
UPDATE: Firefox 40.0.1