We added the telemetry probes in bug 1579507 [1] to see how many users still use FTP. The usage was pretty low as you can see in bug 1570155 [2].

[1] https://bugzilla.mozilla.org/show_bug.cgi?id=1579507
[2] https://bugzilla.mozilla.org/show_bug.cgi?id=1570155#c5


On 3/19/20 10:26 AM, Johann Hofmann wrote:
Can you share some insight into the usage telemetry that was considered for unshipping this?

On Thu, Mar 19, 2020 at 9:02 AM Henri Sivonen <hsivo...@mozilla.com <mailto:hsivo...@mozilla.com>> wrote:

    On Thu, Mar 19, 2020 at 2:24 AM Michal Novotny
    <michal.novo...@gmail.com <mailto:michal.novo...@gmail.com>> wrote:
     > We plan to remove FTP protocol implementation from our code.

    Chrome's status dashboard says "deprecated" and
    https://textslashplain.com/2019/11/04/bye-ftp-support-is-going-away/
    said the plan was to turn FTP off by default in version 80. Yet, I
    just successfully loaded ftp://ftp.funet.fi in Chrome 80 on Mac and in
    Edge 82 (Canary) on Windows 10, and I'm certain I haven't touched the
    flag in either. (The location bar kept showing the ftp:// URL, so it
    doesn't appear to be a case of automatically trying HTTP.)

    Do we know why Chrome didn't proceed as planned? Do we know what their
    current plan is?

    Do we know if Edge intends to track Chrome on this feature or to make
    an effort to patch a different outcome?

-- Henri Sivonen
    hsivo...@mozilla.com <mailto:hsivo...@mozilla.com>
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