Hardware

The add-on could not be downloaded because of a connection failure – Firefox error


If you cannot download and install any addon and you receive an error The add-on could not be downloaded because of a connection failure on your Firefox browser, then here is how you can still download and install it.  The error occurs because the server is not responding to the request made by the user.

The add-on could not be downloaded because of a connection failure

1] Manually Download Extension

Open XPI Download file with Firefox Internet issue

Just before we start, since we are downloading a file, I will suggest using a download manager. In case of issues, you can resume the download.

  1. Open the Add-on page and look for Add to Firefox button. If you are using a third party website, look for the download link.
  2. Right-click on the Download link or Add to Firefox button. Select Save as.
  3. It will get saved as a .xpi file. You can choose the default name or add your name.
  4. Press the Enter button to start the download.
  5. Once the download is complete, If asked, opt to open it with Firefox. The addon will get installed. If not, you can choose to open with Firefox.

2] Enable xpinstall flag

  1. Go to about:config then click on “I’ll be careful I promise” button.
  2. Type xpinstall.enabled to find the settings
  3. Double click to set the value to true

XPInstall Enabled Firefox

While these two should be enough to download the extension in case of a connection failure, sometimes you need to wait. It could be a temporary issue that gets resolved on its own. In the end, I will recommend using VPN software. If there is anything that your ISP is blocking, the VPN connection should be able to resolve.

I hope you were able to fix the issue, and get rid of the error message—The add-on could not be downloaded because of a connection failure – Firefox error.


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