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Showing content from https://support.mozilla.org/en-US/kb/use-firefox-interface-other-languages-language-pack below:

Firefox lets you display menus, notifications, messages and other parts of the Firefox interface in different languages.

Switch Firefox to another language

You can switch languages at any time to display Firefox menus, notifications, and messages in a different language.

In the Menu bar at the top of the screen, click and then select or , depending on your macOS version.Click the menu button and select .
In the Language section of the panel, choose a language in the drop-down menu.
Restart Firefox.

Note:

If you are using Firefox Developer Edition or Firefox Nightly, you will need to download a new copy in the language you wish to use from the

Add languages to the Firefox interface

Follow these steps to add more languages to Firefox.

In the Menu bar at the top of the screen, click and then select or , depending on your macOS version.Click the menu button and select .
In the Language section of the panel, click in the drop-down menu.
Click and choose the languages you want to add, then click the Add button.
Use the Move Up and Move Down buttons to change the order, or Remove to pull a language out from the list.
Click OK to save your changes.

Firefox will display the first language as your default and will display alternate languages if necessary in the order they appear.

Set an order of preference for languages

If a Firefox feature is not available in your top language, Firefox will display your next preferred language.

In the Menu bar at the top of the screen, click and then select or , depending on your macOS version.Click the menu button and select .
In the Language section of the panel, click Set Alternatives to open the Firefox Language Settings window.
Select a language and use the Move Up and Move Down buttons to change the order, or Remove to pull a language out from the list.

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