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  • Mozilla Firefox 79 is a fast, secure and easy to use web browser.As it is powered by a new Quantum engine, Firefox has doubled its speed. And the result of that is the new generation of Web discovery - a more intuitive and useful browser.
  • With the release of iOS 14, you can now make Firefox your go-to, get-it-done, default browser. And with Firefox widgets, you can jump right to searching the web or using private browsing mode straight from your phone’s home screen. PRIVACY CONTROL IN ALL THE RIGHT PLACES Firefox gives you greater privacy protection while you’re on the web.

Mozilla Firefox 68 is a fast, secure and easy to use web browser.As it is powered by a new Quantum engine, Firefox has doubled its speed. And the result of that is the new generation of Web discovery - a more intuitive and useful browser. Uninstall Firefox - If you installed Firefox with the distro-based package manager, you should use the same way to uninstall it - see Install Firefox on Linux for details. If you downloaded and installed the binary package from the Firefox download page, simply remove the folder firefox in your home directory to uninstall Firefox.

This article will describe how Firefox handles downloads for different types of files and how you can change that behavior.

  • For help with download problems, see What to do if you can't download or save files.
  • For help with embedded media on web pages, see Fix common audio and video issues.
  • For help changing the e-mail program that Firefox uses, see Change the program used to open email links.

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When you click a link to download a file, you may see a dialog asking whether you want to save the file or open it with a specific application, if Firefox cannot handle the file internally. The Media type, also called the MIME type or Content type, as configured by the web server, will determine what action Firefox will take.

Note: Firefox will not be able to properly handle a file download if a misconfigured web server sends it with an incorrect Content type. For example, Firefox may display the content as plain text instead of opening the file in an application or asking you what to do. (To learn more, see Properly configuring server MIME types at MDN web docs.) You can contact the website in such cases or you can try a Firefox extension such as Content-Type Fixer to work around the problem.

When you tell Firefox to open or save the file and also check the option to 'Do this automatically for files like this from now on' (see below), a new Content Type and Action entry for that type of file will appear in the Applications section of the General panel in Firefox OptionsPreferences.

You can change what action Firefox takes for defined content types. This will not affect media embedded in a web page - only links to the files themselves.

  1. Click the menu button and select ..
  2. In the General panel, go to the Applications section.
  3. Select the entry for the file type you want to change.
    Multiple entries for the same file format or extension? Some file types can include more than one Internet Media type.
  4. The Action column will give you a drop-down menu, with options on action to take, whenever you click that type of file.
    • Preview in FirefoxOpen in Firefox: Select this if you want Firefox to display the content. It only applies to a limited number of file types that Firefox is able to decode, such as Portable Document Format (PDF).
    • Always ask: This will prompt you to select what action you want Firefox to take when you click on that type of file. This can be useful if Firefox is automatically saving a file type or is always opening it with a certain program and you want to be asked what to do.
    • Save File: This will always save the file to your computer using the Downloads window, whenever you click that type of file.
    • Use ... : Open the file with an application of your choosing.
  5. Close the about:preferences page. Any changes you've made will automatically be saved.

When you click on a link for a type of file that doesn't have a set content type and download action, Firefox will ask you how to handle the file:

  • Open with: Saves the file to a temporary folder and opens it in the default application for that file type. To select an application, click .
Warning: Do not choose Firefox to always open a certain file type, as doing so can cause a problem where Firefox repeatedly opens empty tabs or windows after you click on a link.
  • Save file: Saves the file to the download folder (specified in the General panel of Firefox OptionsPreferences).
  • Do this automatically for files like this from now on: Check mark this setting and then click to add a new entry to the Content Type list for that file type.
Is Do this automatically for files like this from now on disabled? This can happen if the website's server incorrectly specifies the Internet Media type of the file. It also can happen if the server assigns 'Content-Disposition: attachment' to the file.

If you are having problems with how Firefox is handling file downloads that you can't resolve, or if you just want to start fresh, you can restore the default content types and actions by manually deleting the file that stores these settings.

This will remove all customized content type actions. You will have to make those changes over again after you take the following steps.

  1. Open your profile folder:

    • Click the menu button , click Help and select Troubleshooting Information.From the Help menu, select Troubleshooting Information. The Troubleshooting Information tab will open.
    • Under the Application Basics section next to Profile FolderDirectory, click . A window will open that contains your profile folder.Your profile folder will open.
    Note: If you are unable to open or use Firefox, follow the instructions in Finding your profile without opening Firefox.
  2. Close Firefox. Click the Firefox menu and select Exit.Click the Firefox menu at the top of the screen and select Quit Firefox.Click the Firefox menu and select Quit.
  3. Delete (or rename) the handlers.json file.
  4. Restart Firefox.
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 version, 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:

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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.
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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:

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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.

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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: