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ff v65.0


29. january 2019



  • Enhanced tracking protection: Simplified content blocking settings give users standard, strict, and custom options to control online trackers. A redesigned content blocking section in the site information panel (viewed by expanding the small “i” icon in the address bar) shows what Firefox detects and blocks on each website you visit. To learn more about content blocking, visit the Mozilla Blog.

  • A better experience for multilingual users: An updated Language section in Preferences allows users to install multiple language packs and order language preferences for Firefox and websites, without having to download locale-specific versions.

  • Support for Handoff on macOS: Continue browsing across devices. Pick up where you left off with iOS (via Firefox or Safari) on Firefox on Mac.

  • A better video streaming experience for Windows users: Firefox now supports the next-generation, royalty-free video compression technology called AV1. Read about Mozilla’s contribution to this new open standard.

  • Improved performance and web compatibility, with support for the WebP image format: WebP brings the same image quality as existing formats at smaller file sizes, which saves bandwidth and speeds up page load.



  • Enhanced security for macOS, Linux, and Android users via stronger stack smashing protection which is now enabled by default for all platforms. "Stack smashing" is a common security attack in which malicious actors corrupt or take control of a vulnerable program.

  • Firefox will now warn you when closing a window (regardless of whether you have automatic session restore enabled for restart).

  • Easier performance management: The revamped Task Manager page found at about:performance now reports memory usage for tabs and add-ons.

  • Improved the pop-up blocker to prevent multiple pop-up windows from being opened by websites at the same time.



  • Additional support for Flexbox: Launched a new Flexbox inspector tool that details Flexbox containers and helps debug Flex item sizes.

  • All CSS changes made in the Rules panel are now tracked in the new Changes tab.

  • Added support for the Storage Access API on desktop platforms.

Developer Information

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Mozilla halts Firefox 65 distribution on Windows.


It became clear quickly that some antivirus solutions on Windows, Avast and AVG were named explicitly, caused the issue in Firefox 65.0.

Mozilla decided to halt the distribution of the update on Windows. Windows users won't get upgraded to Firefox 65.0 automatically anymore until the issue is resolved. It is still possible, however, to download the installer to upgrade Firefox manually.


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Interesting. My laptop was updated to Firefox 65.0 and I've not seen any problems with Norton Security Deluxe. Guess I was just lucky.

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ff v65.0.1


12. february 2019



  • Fixed accidental requests to addons.mozilla.org when an addon recommendation doorhanger is shown (bug 1526387)

  • Improved playback of interactive Netflix videos (bug 1524500)

  • Fixed color management not working on macOS (bug 1506495)

  • Fixed incorrect sizing of the "Clear Recent History" window in some situations (bug 1523696)

  • Fixed audio & video delays while making WebRTC calls (bug 1521577 & bug 1523817)

  • Fixed video sizing problems during some WebRTC calls (bug 1520200)

  • Fixed looping CONNECT requests when using WebSockets over HTTP/2 from behind a proxy server (bug 1523427)

  • Fixed the "Enter" key not working on password entry fields for certain Linux distributions (bug 1523635)

  • Various stability and security fixes.


  • Made support for <meta> viewport tags in Responsive Design Mode, initially enabled in Firefox 64, pref-controlled and off by default (bug 1521814). To restore the previous behavior, change the devtools.responsive.metaViewport.enabled pref to true.

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