Firefox Version 84

30-04-2021
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The extension will be automatically installed starting Rapport version 3.5.1930.424 Step 1: After completing the installation you will receive a pop-up prompting you to enable the Firefox Extension. Step 2: Click OK. However it is recomended to crosscheck the compattibility of the version of GeckoDriver you are downloading as per the matrix below: This usecase For firefox version 84.0.1 you can use either of the following version of GeckoDriver.

Other Languages:

  • Stable: http://www.mozilla.org/en-US/firefox/all/
  • Beta: http://www.mozilla.org/en-US/firefox/beta/all/


Mozilla Firefox is a fast, full-featured Web browser. Firefox includes pop-up blocking, tab-browsing, integrated Google search, simplified privacy controls, a streamlined browser window that shows a number of additional features that work with you to help you get the most out of your time online.

Installation
Installing Firefox was a fine , quick experience.A new feature checks your add-ons to see which ones you installed and which ones come from third-party vendors, such as security suite makers. The browser will now ask you if you'd like to disable any of these third-party add-ons.

Interface
The menu bar has been squished into an orange button on the upper left, with menu options spread across two columns.the menu makes it much easier to get to bookmarks, add-ons, and history, as they now all live on one Menu pane.

Performance
Firefox is built on top of the powerful new Gecko platform, resulting in a safer, easier to use and more personal product.Mozilla plans to crowdsource its performance data to learn more about how the browser performs in real-world situations.

Features
Firefox's features are robust and generally competitive. The most important feature in the modern Firefox is Sync.Sync now smoothly syncs your bookmarks, passwords, preferences, history, and tabs, not only with other computers, but also with your Android version of Firefox.

This article provides information about the changes in Firefox 84 that will affect developers. Firefox 84 was released on December 15, 2020.

Note: See also And now for … Firefox 84 on Mozilla Hacks.

PortableFirefox Version 84

Firefox Version 84 Download

Changes for web developers

Developer Tools

  • The Firefox Accessibility Inspector now supports displaying the keyboard tab order on a web page. This provides a better high-level overview of how the page will be navigated using the keyboard than tabbing through the links (bug 1654956).

HTML

CSS

  • We've added support for complex selectors to the :not pseudo-class (bug 933562).

Removals

  • We've removed the proprietary -moz-default-appearance property values scrollbar-small (scrollbar-width: thin is used instead) and scrollbar (macOS only; scrollbar-horizontal and scrollbar-vertical are used instead) (bug 1673132).

JavaScript

  • Custom date/time formats specified as options to the Intl.DateTimeFormat() constructor can now include fractionalSecondDigits — the number of digits used to represent fractions of a second (bug 1645107).

HTTP

Security

  • Firefox now ensures that localhost URLs — such as http://localhost/ and http://dev.localhost/ — refer to the local host's loopback interface (e.g. http://127.0.0.1). As a result, resources loaded from localhost are now assumed to have been delivered securely (see Secure contexts), and also will not be treated as mixed content (bug 1220810, bug 1488740).

APIs

  • We've added support for the PerformancePaintTiming interface of the Paint Timing API (bug 1518999).
  • The Navigator.registerProtocolHandler() method now only accepts two parameters: scheme and url. title has been removed (bug 1631464).

Media, WebRTC, and Web Audio

  • The MediaRecorder.start() method now throws an InvalidModificationError if the number of tracks on the stream being recorded has changed (bug 1581139).

Removals

Firefox Version 84.0 Download

  • The application cache has been removed — developers should use the Service Worker API instead (bug 1619673).

WebAssembly

Firefox Free Download

WebDriver conformance (Marionette)

  • Added chrome scope support for WebDriver:PerformActions and WebDriver:ReleaseActions (bug 1365886).
  • The new Fission-compatible API has been enabled by default now. To revert to the former API the marionette.actors.enabled preference has to be set to false (bug 1669169).
  • Fixed WebDriver:SwitchToWindow to always switch back to the top-level browsing context (bug 1305822).
  • Improved browsing context checks for WebDriver:SwitchToParentFrame (bug 1671622).
  • Fixed a hang for WebDriver:Back encountered when the currently-selected <iframe> gets unloaded (bug 1672758).

Known bugs

  • After page navigation, accessing a previously-retrieved element might not always raise a 'stale element' error, and can also lead to a 'no such element' error. To prevent this, set the marionette.actors.enabled preference to false (bug 1684827).

Changes for add-on developers

  • The browsingData.remove() API now supports removing a subset of data types by cookieStoreId.

Older versions