This site will have limited functionality while we undergo maintenance to improve your experience. If an article doesn't solve your issue and you want to ask a question, we have our support community waiting to help you at @FirefoxSupport on Twitter and/r/firefox on Reddit.

Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More

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

  • 2 ŋuɖoɖowo
  • 1 masɔmasɔ sia le esi
  • 6 views
  • Nuɖoɖo mlɔetɔ Charles Heller

more options

I have been having a problem for a while that has been preventing me from downloading add-ons that are on sites separate from the add-on site, whenever I try to download an add-on, like say, the new test pilot add-on, it tells me "The add-on could not be downloaded because of a connection failure". I have tried many ways around it, such as right clicking and saving link, that works, but not for Test Pilot, also disabling all my add-ons, didn't work, disabling my AV temporarily, didn't work, and adding the string xpinstall.enabled did not work either. Any help would be great, I'd like to be able to download add-ons again. Especially Test Pilot.

I have been having a problem for a while that has been preventing me from downloading add-ons that are on sites separate from the add-on site, whenever I try to download an add-on, like say, the new test pilot add-on, it tells me "The add-on could not be downloaded because of a connection failure". I have tried many ways around it, such as right clicking and saving link, that works, but not for Test Pilot, also disabling all my add-ons, didn't work, disabling my AV temporarily, didn't work, and adding the string xpinstall.enabled did not work either. Any help would be great, I'd like to be able to download add-ons again. Especially Test Pilot.
Screen ƒe photowo kpe ɖe eŋu

All Replies (2)

more options

Hello TishonHeart,

any luck if you delete in your profile folder the User.js file you have ?

The user.js file does not exist by default. If you create the file, forget it, if you have not create the file then delete the User.js file, to see if the problem goes away (some programs create and write in the file also).

If you have the same behavior after you delete the user.js file, then please try to create a new firefox profile and see if the issue persist.

thank you

more options

ideato said

Hello TishonHeart, any luck if you delete in your profile folder the User.js file you have ? The user.js file does not exist by default. If you create the file, forget it, if you have not create the file then delete the User.js file, to see if the problem goes away (some programs create and write in the file also). If you have the same behavior after you delete the user.js file, then please try to create a new firefox profile and see if the issue persist. thank you

Nope, even after the steps you gave me I still get the error message while trying to download add-ons from any site that's not the official add-on website for Firefox.