Firefox 39

• Firefox 39 Portable
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• Firefox 39 Portable
• Firefox 39.0 Download

Install Firefox Extended Support Release. Firefox Extended Support Release (ESR) is an official version of Firefox developed for large organizations such as universities and businesses. Firefox ESR does not come with the latest features, but it does have the latest security and stability fixes.

This article describes problems where Firefox cannot load websites but other Web browsers (such as Internet ExplorerInternet Explorer or Microsoft EdgeSafariEpiphany on Gnome or Konqueror on KDE) can. When this happens, Firefox may show a Server not found or Unable to connect error message.

• For other error messages that display when you try to view websites in Firefox, see Websites don't load - troubleshoot and fix error messages.
• If none of the Web browsers on your computer can load websites, see Firefox and other browsers can't load websites.

Firefox 39.0.3 Free. Firefox is one of the best open source web browsers. 4.2 (41,043 votes) 85.0 Mozilla. Review Comments (711) Questions & Answers (108) Update. Get Firefox, a free web browser backed by Mozilla, a non-profit dedicated to internet health and privacy. Available now on Windows, Mac, Linux, Android and iOS.

Table of Contents

Firefox 39 Portable

• 5Firefox cannot load certain websites

If you were able to load websites until you updated Firefox or until your Internet security software was updated, reconfigured or a new one was added, your Internet security software (including firewalls, antivirus programs, anti-spyware programs, and more) is likely preventing Firefox from connecting to the Internet.

In general, you should make sure your Internet security software is up-to-date and remove Firefox from your program's list of trusted or recognized programs, then add it back. For instructions on how to configure some programs, see the Configure firewalls so that Firefox can access the Internet article.

If you connect to the Internet through a proxy server that is having connection problems, you will not be able to load websites. To check your connection settings in Firefox:

1. Click the menu button and select ..
2. In the General panel, go down to the Network ProxyNetwork Settings section.
3. In the Network ProxyNetwork Settings section, click .
4. Change your proxy settings:
   • If you don't connect to the Internet through a proxy (or don't know whether you connect through a proxy), select No Proxy.
   • If you connect to the Internet through a proxy, compare Firefox's settings to another browser's (such as Internet Explorer — see Microsoft's guide to proxy settings)(such as Safari — depending on your OS X version, see Mac OS X 10.6: Enter proxy server settings, OS X Lion: Enter proxy server settings, or OS X Mountain Lion: Enter proxy server settings).
5. Close the Connection Settings dialog.
6. Close the about:preferences page. Any changes you've made will automatically be saved.

If you find that changes you make to your Firefox connection settings are not remembered when you restart Firefox, see How to fix preferences that won't save.

Firefox supports IPv6 by default, which may cause connection problems on certain systems. To disable IPv6 in Firefox:

1. Type about:config in the address bar and press EnterReturn.
   A warning page may appear. Click to go to the about:config page.
2. In the Search field, enter network.dns.disableIPv6.
3. In the list of preferences, double-clickclick the Toggle button next tonetwork.dns.disableIPv6 to set its value to true.

Firefox attempts to speed up loading new websites by using DNS Prefetching, which can cause page load errors with some system configurations. To disable DNS Prefetching:

1. Type about:config in the address bar and press EnterReturn.
   A warning page may appear. Click to go to the about:config page.
2. Right-clickHold down the control key while you click in the list of preferences, select New, and then select Boolean.
3. In the Enter the preference name field, enter network.dns.disablePrefetch and click .
4. Select true when prompted to set the value and click .

1. Type about:config in the address bar and press EnterReturn.
   A warning page may appear. Click to go to the about:config page.
2. Enter the preference name network.dns.disablePrefetch in the about:config search bar.
   • If the preference doesn't already exist, select Boolean and click the Add button.
3. Press the Toggle button to set the preference value to true, if it's not already set.

If you find that Firefox can load some websites but not others, first clear your Firefox cookies and cache:

1. Click the Library button on your toolbar. (If you don't see it there, click the menu button then click Library.) Click and select .
2. In the Time Range to clear: drop-down, select Everything.
3. Below the drop-down menu, select both Cookies and Cache. Make sure other items you want to keep are not selected.
4. Click .

Check for malware

If clearing your cookies and cache did not enable you to load the websites that did not work in Firefox, you should check your computer for malware. Certain types of malware are known to target Firefox and can prevent it from loading various websites: 888 free spins.

• If you have an antivirus or Internet security program, update its detections database and do a full scan of your system.
• If you still have problems, follow the instructions in Troubleshoot Firefox issues caused by malware.

A Firefox extension could be causing the issue, especially the ones that have network access and/or those that rely on manipulating webpage content. Lego® star wars™: the force awakens (2016). Try disabling your extensions in the Add-ons Manager one by one and then reload the page. See Disable or remove Add-ons and Troubleshoot extensions, themes and hardware acceleration issues to solve common Firefox problems for more information.

Based on information from Error loading websites (mozillaZine KB)

Doing second language research james dean brown pdf to jpg. Apple smart keyboard german layout. Firefox 39 was released on July 2, 2015. This article lists key changes that are useful not only for web developers, but also Firefox and Gecko developers as well as add-on developers.

Changes for Web developers

Developer Tools

Highlights:

All devtools bugs fixed between Firefox 38 and Firefox 39.

CSS

• Support of the type on list-style-type, as well as its shorthand property list-style has been implemented (bug 1144607).
• CSS Scroll Snapping has been implemented (bug 945584 and bug 1138658).
• Cascading of CSS Animations and CSS Transitions has been rewritten to match the latest specification (bug 1125455).
• Support for vertical scripts, with the writing-mode is now turned on by default on Nightly and Developer Edition, but not on Firefox Beta and Firefox Release (bug 1099032). Note that implementation is not yet complete and some widgets, like tables, will not obey to all values.
• CSS filter acts like position: relative + overflow: hidden (bug 1125767).

HTML

• A new ARIA role, switch, is now supported (bug 1136563).
• Support for allowing to anticipate a future connection without revealing any information has been implemented (bug 1135160).

JavaScript

• The RegExp constructor no longer throws when the first argument is a RegExp and the second flags argument is present (bug 1108949).
• The Object.prototype.__noSuchMethod__ property is now deprecated and throws a console warning (see bug 1140428 and this platform announcement).
• The implementation of the Proxy object has been updated to comply more with the ES2015 specification:
  • The defineProperty and set handlers now need to explicitly return true to be successful, otherwise a TypeError exception will be thrown in strict mode (bug 1132522).
  • If the window object is set as the target, those handlers will now throw a TypeError (bug 828137).
• When using arrow functions (=>), a line terminator (n) is no longer allowed after arrow function arguments (() n => {}) (bug 1141392).
• RegExp.prototype.toString is now a generic function (bug 1079919).
• The non-standard flags argument of String.prototype.match(), String.prototype.search(), and String.prototype.replace() is now deprecated and throws a console warning (bug 1142351).
• The try/catch behavior of Object.assign() has been removed to conform with the latest ES2015 draft (bug 1103344).

Interfaces/APIs/DOM

• The experimental CanvasRenderingContext2D.addHitRegion() method now accepts a path option, which allows you to add hit regions to Path2D objects (bug 1129147).
• New methods have been added to manipulate FormData objects (bug 1085283) and FormData is now supported in Web workers (bug 739173).
• The non-standard XMLHttpRequest.sendAsBinary() method has been removed (bug 853162).
• Progress in our experimental implementation of Web Animations: AnimationPlayer.startTime is now writeable (bug 1073379).
• Progress in our experimental implementation of Service Workers: Cache and CacheStorage interfaces are now implemented (bug 940273).
• The experimental Fetch API has been activated by default (bug 1133861).
• Progress in our experimental implementation of WebGL2: WebGLSync is now implemented (bug 1048721).
• Support for MouseEvent.offsetX and MouseEvent.offsetY have been added on desktop (bug 69787, but not on Firefox for Android or Firefox OS (they will be added in Firefox 43).

MathML

SVG

No change.

Audio/Video

Mozilla Firefox 39 Download Google

Miscellaneous

• WOFF2 fonts support is now turned on by default in release version of Firefox (Beta and Release, in addition of Nightly and Developer Edition) (bug 1084026).
• The -remote command-line option has been removed (bug 1080319).

• Support for new Unicode 8.0 skin tone emoji (bug 1153460).

Networking

• Support for SSLv3 has been completely removed (bug 1106470).

Security

Changes for add-on and Mozilla developers

No change.

Firefox 39 Portable

See also

Firefox 39.0 Download

Older versions