Mozilla publishes Firefox Nightly localized versions download page

Martin Brinkmann
Sep 15, 2016

Firefox Nightly is the cutting edge version of the Firefox web browser that sometimes gets updated several times a day.

It is not meant for production environments, but is the first version changes are applied to and new features are introduced in.

This makes it popular with developers, Mozilla employees, users interested in early-access tech and other enthusiasts.

Nightly was offered as a US English version only on the official download site up until today. Users who wanted to grab a localized version of Firefox Nightly had to navigate the Mozilla FTP server to find that version and download it.

It comes as no surprise that more than 90% of Firefox Nightly users are using the US English version of the web browser. The main issue with it was that localized versions did not receive the same scrubbing as the US English version, and that some users would not download Nightly because they could not locate a localized version of the browser easily.

Until recently, the only way to get Firefox Nightly for desktop was to download it in English from or, if you wanted a build in say Japanese, Arabic or French, look for the right FTP sub-folder in is itself a static HTML page based on a script that scraps the FTP site for builds periodically.

Of course, as a result, about 90% of our Nightly users use an en-US build. The few thousand users using a localized build are Mozilla localizers and long term contributors that knew where to search for them. We were clearly limiting ourselves to a subset of the population that could be using Firefox Nightly which is not a good thing when you want to actually grow the number of nightly users so as to get more feedback (direct and anonymous).

firefox nightly localized versions download

The new Nightly download page changes that, as it makes Firefox Nightly available in fully localized versions right on that page.

The page looks similar to the download pages of the other Firefox download channels. Basically, what you get is a list of languages and next to it download buttons for the supported operating systems.

These are at the time of writing Windows, windows 64-bit, OS X, Linux, and Linux 64-bit.

In case you are wondering why it took so long to get a proper download page for Firefox Nightly. According to Mozilla, one reason why the organization could not offer a download page similar to those of the release, beta and dev channels of Firefox was technical.

The API that the Release Management team uses to populate the download pages did not provide information about Firefox Nightly. Mozilla switched to the new API this August which allowed for desktop Nightly data to be pulled and used to populate the download page.

The page will be linked to from the Nightly site eventually, but that is not the case currently. Mozilla is working on that though.

Closing Words

Making Nightly available in localized languages, or at least making downloads for these localized builds easier to find, will certainly increase the number of users who will give Firefox Nightly a try.

Now You: Which localized version of Firefox are you running, if any?

Mozilla publishes Firefox Nightly localized versions download page
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Mozilla publishes Firefox Nightly localized versions download page
Mozilla published a new download page for Firefox Nightly today that lists all supported languages and localized builds on a page.
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  1. Ben said on September 16, 2016 at 9:50 am

    There were localized nightlies? Some months ago there was only english and nothing else.
    But you could always get the languagepack from the beta/release and this would work, but you had to get the xpi every time from the ftp manually.
    I did that because the hotkeys are different in some languages, but I found out, that you can edit hotkeys with MenuEditor, so now I just run the english version with changed hotkeys.

    Oh, btw Martin, did you change something with the session/”login” cookie expiration? Some months ago I could write a comment and then did not have to “login” for some days. Now I have to “login” for every comment – which means more work for you because you have to moderate every comment.

    1. Sören Hentzschel said on September 16, 2016 at 11:18 am

      > There were localized nightlies? Some months ago there was only english and nothing else.

      Yes, there were always localized nightlies, but in another directory on the “ftp” site: latest-mozilla-central-l10n and not latest-mozilla-central. offers en-US only.

      1. Ben said on September 16, 2016 at 1:08 pm

        > when did you notice the issue the first time?
        Some weeks ago I guess. Before that I could comment for several days without moderation (after the first moderation).

      2. Ben said on September 16, 2016 at 11:37 am

        Always got my nightlies from

        As you can see, you have to moderate again.

        I have only three relevant cookies:
        The last two normally store the username/email but they are set to expire at the time the comment was written, so even the autofill does not work anymore.
        All scripts for are allowed. And yout system does not to use HTML5 storage.

      3. Martin Brinkmann said on September 16, 2016 at 12:41 pm

        Ben, when did you notice the issue the first time? I can confirm that cookies are indeed set to expire the same day instead of the next year, but have no clue what could possibly be responsible for the change.

    2. Martin Brinkmann said on September 16, 2016 at 10:37 am

      Are you writing comments on a desktop computer or mobile?

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