How to Change the Default Languages in Mozilla Firefox

Tell Firefox which language you prefer when viewing webpages

Books of language dictionaries on shelf

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Some websites can be rendered in several different languages, depending on their configuration and your web browser's abilities and settings. Mozilla Firefox, which supports over 240 global dialects, provides the ability to specify which languages you prefer to use when viewing web content.

Before rendering text on a page, Firefox first validates whether or not it supports your preferred languages in the order you specified them. The page's verbiage is then displayed in your preferred language if possible. Here's how to specify a preferred language in Firefox.

Not all web pages are available in all languages.

How to Specify Preferred Languages in Firefox

Setting and modifying Firefox's list of preferred languages can be done quickly. See the steps below:

  1. In Firefox, select the menu icon (3 horizontal bars) in the top right corner.

    You can also type about:preferences into the Firefox address bar.

    Mozilla Firefox browser.
  2. Select Options.

    Selecting options in Firefox.
  3. In General preferences, scroll down to the Language and Appearance section.

    Viewing options in Firefox.
  4. Under the Language subheading, you should see your default language. Select Set Alternatives.

    Selecting to search for another language in Firefox.
  5. Click on the Select a language to add... drop-down menu.

    Select a language to add... item in Webpage Language Settings
  6. Scroll through the alphabetical language list and select the language of your choice. To move it into the active list, select Add.

    Add language button in Firefox Webpage Language Settings dialog
  7. When you're satisfied with your changes, select OK to return to Firefox's preferences. Once there, close the tab or enter a URL to continue your browsing session.

Your new language should now be added to the preferences list. By default, the new language goes at the top of the list. To change its order, use the Move Up and Move Down buttons accordingly. To remove a specific language from the preferred list, select it, and select Remove.

Firefox displays the first language as your default while browsing. Alternate languages are displayed if necessary in the order they appear on this list.