Using Connect after the Firefox 52 release

Mozilla released the Firefox 52 version of its browser on March 7, 2017. Firefox 52 drops NPAPI support, which may affect your use of the Aspera Connect plugin on Firefox.

Am I affected?

You are affected if you use Firefox 52 and can no longer use Connect as before. Your web application may tell you that Connect is not installed, even though it is, and transfers will no longer work.


If you are affected, the issue most likely has to do with your web application server, which your server administrators will need to upgrade. Send your server admin the following article for more information: Supporting Connect on your server after the Firefox 52 release

In the meantime, you can also use Safari or Internet Explorer, which are browsers that still support NPAPI and ActiveX respectively.


There are other workarounds you can employ if you want to continue using Firefox.

1. Enable NPAPI support in Firefox 52.

a. In your address bar, type the following and hit enter: about:config

b. Click the I accept the risk! button

c. Right click anywhere in the table and select New > Boolean. Enter plugin.load_flash_only as the preference name, then click OK.

d. Select false as the value, then click OK.

e. Restart your Firefox browser (close and reopen it)

Note that Firefox 53 will NOT have this workaround available. Firefox 53 is slated to be released in April 2017 and will not have the option to enable NPAPI.

2. Downgrade your Firefox to version 51 or earlier

Old installers for Firefox 51 can be found here:

Have more questions? Submit a request


  • Avatar
    Gregory Almond

    Is there an ETA as to when this issue will be rectified by Aspera? NPAPI support is being removed from many popular web browsers, and downgrading/using an old browser seems to be an inefficient way of mitigating the issue.

  • Avatar
    Andrea Campos

    Hi Gregory,

    This issue has already been resolved with the latest version of Connect, which does not depend on NPAPI. If you use the latest version of Connect on an up to date web server, you are good to go on all modern web browsers.

    This article is addressing the situation where you cannot use the latest version of Connect because of an outdated web server (such as an out of date Faspex, Shares or Connect Server). If your server admin cannot immediately upgrade, then these workarounds should be employed. Otherwise, upgrading to the latest Connect plug-in will allow you to use Firefox 52 and other latest browser versions.

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