Mozilla Firefox Description. Mozilla Firefox is a free, fast and efficient cross-platform web browser and one of the most popular browsers in use. Firefox boasts speed and tabbed. Firefox 39: Tracking Protection for private browsing mode by Martin Brinkmann on March 27, 2015 in Firefox - 26 comments Mozilla has been working on a privacy feature called Tracking Protection for some time now. Download Firefox 39.0 for Windows PC from FileHorse. 100% Safe and Secure Free Download 32-bit Software Version.
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.
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Aug 07, 2015 Screenshot for Mozilla Firefox 39.0.3 Final « TweakNow RegCleaner 7.3.6 Mozilla Firefox 39.0.3 Final MxNitro 1.1.1.800 Beta / 1.0.1.3000 » Comment Rules & Etiquette - We welcome all comments from our readers, but any comment section requires some moderation. Some posts are auto-moderated to reduce spam, including links and swear words. 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: WebIDE now supports debugging Firefox OS devices over Wi-Fi; WebIDE now supports Cordova projects.
- 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.
Note: Some Internet security programs can block Internet access even when they are in a 'disabled' state.
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:
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- Click the menu button and select ..
- In the General panel, go down to the Network ProxyNetwork Settings section.
- In the Network ProxyNetwork Settings section, click .
- 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).
- Close the Connection Settings dialog.
- 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:
- Type about:config in the address bar and press EnterReturn.
A warning page may appear. Click to continue to the about:config page. - In the Search field, enter network.dns.disableIPv6.
- In the list of preferences, double-clickclick the Toggle button next tonetwork.dns.disableIPv6 to set its value to true.
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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:
- Type about:config in the address bar and press EnterReturn.
A warning page may appear. Click to continue to the about:config page. - Right-clickHold down the control key while you click in the list of preferences, select New, and then select Boolean.
- In the Enter the preference name field, enter network.dns.disablePrefetch and click .
- Select true when prompted to set the value and click .
- Type about:config in the address bar and press EnterReturn.
A warning page may appear. Click to continue to the about:config page. - 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.
- 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:
- Click the Library button on your toolbar. (If you don't see it there, click the menu button then click Library.) Click and select .
- In the Time Range to clear: drop-down, select Everything.
- Below the drop-down menu, select both Cookies and Cache. Make sure other items you want to keep are not selected.
- 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:
- 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. 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.
![Firefox 39 Firefox 39](https://2.bp.blogspot.com/-CBON0lg08xE/VYQ6P_w03jI/AAAAAAAAA6I/3eEONTT5RJc/s1600/firefox.jpg)
Based on information from Error loading websites (mozillaZine KB)
Warning: Firefox now includes downgrade protection to prevent corruption of user profile data. If you install an older version, you'll be prompted to create a new Firefox profile.
If there is a problem with a Firefox, most people will try to revert Firefox back to the way it was before and downgrade it, but we do not recommend this action. Downgrading Firefox leaves a user more vulnerable to attacks and, on most occasions, doesn't fix the problem that occurred while updating. This article gives you some alternatives to downgrading and links to old versions of Firefox, if you do choose to downgrade.
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Problems with an update are generally not caused by the new version of Firefox, but rather the update process. Installing a previous version will not help in most cases. Instead, see:
Note: Other problems can be solved with the Refresh Firefox feature. It restores Firefox to its default state while saving your essential information.
Ensure all security and security related software is fully updated. Some security software will need to be upgraded to a new version for each Firefox version update.
Optional software bundled with security software may also need updating. Such software may not be essential for your security, but if outdated, it may interfere with the use of Firefox, or cause Firefox to crash.
If you want to downgrade, you can visit Mozilla's directory of older Firefox versions using the link below. Please note, however, that using older versions of Firefox can be harmful and that we recommend you use the newest version of Firefox. Warning: Old Firefox versions pose a significant security risk.
- Firefox 67.0.432-bit (US English)
- Firefox 67.0.464-bit (US English)
- Firefox 67.0.432-bit (US English)
- Firefox 67.0.464-bit (US English)
- Firefox 68.0.232-bit (US English)
- Firefox 68.0.264-bit (US English)
- Firefox 68.0.232-bit (US English)
- Firefox 68.0.264-bit (US English)
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- Firefox 69.0.332-bit (US English)
- Firefox 69.0.364-bit (US English)
- Firefox 69.0.332-bit (US English)
- Firefox 69.0.364-bit (US English)
- Firefox 70.0.132-bit (US English)
- Firefox 70.0.164-bit (US English)
- Firefox 70.0.132-bit (US English)
- Firefox 70.0.164-bit (US English)
- Firefox 71.032-bit (US English)
- Firefox 71.064-bit (US English)
- Firefox 71.032-bit (US English)
- Firefox 71.064-bit (US English)
- Firefox 72.0.232-bit (US English)
- Firefox 72.0.264-bit (US English)
- Firefox 72.0.232-bit (US English)
- Firefox 72.0.264-bit (US English)
- Firefox 73.0.132-bit (US English)
- Firefox 73.0.164-bit (US English)
- Firefox 73.0.132-bit (US English)
- Firefox 73.0.164-bit (US English)
- Firefox 74.0.132-bit (US English)
- Firefox 74.0.164-bit (US English)
- Firefox 74.0.132-bit (US English)
- Firefox 74.0.164-bit (US English)
- Firefox 75.032-bit (US English)
- Firefox 75.064-bit (US English)
- Firefox 75.032-bit (US English)
- Firefox 75.064-bit (US English)
- Firefox 76.0.132-bit (US English)
- Firefox 76.0.164-bit (US English)
- Firefox 76.0.132-bit (US English)
- Firefox 76.0.164-bit (US English)
- Firefox 77.0.132-bit (US English)
- Firefox 77.0.164-bit (US English)
- Firefox 77.0.132-bit (US English)
- Firefox 77.0.164-bit (US English)
- Firefox 78.0.232-bit (US English)
- Firefox 78.0.264-bit (US English)
- Firefox 78.0.232-bit (US English)
- Firefox 78.0.264-bit (US English)
- Firefox 79.032-bit (US English)
- Firefox 79.064-bit (US English)
- Firefox 79.032-bit (US English)
- Firefox 79.064-bit (US English)
Important: By default, Firefox is set for automatic updates. To prevent Firefox from automatically updating itself after you install an older version, you'll need to change your Firefox update settings: Click the menu button and select .. In the General panel, go to the Firefox Updates section.
Instead of downgrading to an older, insecure version of Firefox and changing your update settings, you should consider these alternatives:
Install Firefox Extended Support Release.Firefox Extended Support Release (ESR) is an official version of Firefox developed for large organizations like universities and businesses. Firefox ESR does not come with the latest features but it has the latest security and stability fixes. For more information, see the article Switch to Firefox Extended Support Release (ESR) for personal use.
Use the latest version of another browser. If the current Firefox version is not to your liking or just not working right now, there are alternative browsers that you can use to browse the web.
If the latest version of Firefox is causing problems for you or you just don't like something about it, please give us feedback about it here: