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I keep getting this error: "This add-on could not be downloaded because of connection failure," and I get that at https://addons.mozilla.org/.

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New Contributor

I keep getting this error: "This add-on could not be downloaded because of connection failure," and I get that at https://addons.mozilla.org/.

I was trying to download: https://addons.mozilla.org/en-US/firefox/addon/smallringfx-darkmagenta-213952/

The tab came up top, and said the following: This add-on could not be downloaded because of connection failure

1 ACCEPTED SOLUTION

Accepted Solutions
New Contributor

Re: I keep getting this error: "This add-on could not be downloaded because of connection failure," and I get that at https://addons.mozilla.org/.

Guys i think i solved this issue Smiley Very Happy All what you have to do is go to about:config then click "I'll be careful i promise" now right click somewhere then click New>String and name it: xpinstall.enabled and set the value to true

All the downloads should work now

18 REPLIES
Legendary Contributor

Re: I keep getting this error: "This add-on could not be downloaded because of connection failure," and I get that at https://addons.mozilla.org/.

-> Tap ALT key or press F10 to show the Menu Bar

-> go to Tools Menu -> Clear Recent History -> Time range to clear: select "EVERYTHING" -> click Details (small arrow) button -> place Checkmarks on Cookies, Cache, Site Preferences -> click Clear Now

-> go to Tools Menu -> Options -> Security -> place Checkmarks on:

1) Warn me when sites try to install add-ons 2) Block reported attack sites 3) Block reported web forgeries

-> go to Tools Menu -> Options -> Advanced -> Network -> Offline Storage (Cache): click Clear Now button

-> Click OK on Options window -> Restart Firefox

Check and tell if its working.

New Contributor

Re: I keep getting this error: "This add-on could not be downloaded because of connection failure," and I get that at https://addons.mozilla.org/.

Same problem over here. Not sure if it is related: I created a new profile (via profile manager) and did try to download again some of my existing add-ons in the new profile. All addons.mozilla.org add-ons report the connection failure. I did return back to my old profile, same problem over there. @mha007 : followed your advice - but the issue is still there...

Legendary Contributor

Re: I keep getting this error: "This add-on could not be downloaded because of connection failure," and I get that at https://addons.mozilla.org/.

Unable to install add-ons

https://support.mozilla.com/en-US/kb/Unable%20to%20install%20add-ons

Check and tell if its working.

New Contributor

Re: I keep getting this error: "This add-on could not be downloaded because of connection failure," and I get that at https://addons.mozilla.org/.

mha007, tried your steps, and it doesn't work. I looked at the support page, and nothing there is pertaining to my problem. The error I explained to above is my issue, nothing more.

Although, after changing my settings as perscribed by you in your first comment. I know get the prompt to allow it to download. It looks as if it's going to go through, then it goes right back to the "This add-on could not be downloaded because of connection failure" message.

Also, glad to know I'm not the only one with the error. Hopefully someone would be so kind to solve our dilemma.

New Contributor

Re: I keep getting this error: "This add-on could not be downloaded because of connection failure," and I get that at https://addons.mozilla.org/.

I have the same problem. I'm using Windows 7. And I can't add add-ons. It just tells me: "This add-on could not be downloaded because of connection failure"

New Contributor

Re: I keep getting this error: "This add-on could not be downloaded because of connection failure," and I get that at https://addons.mozilla.org/.

Seriously when are you going to fix it :/ This is HUGE bug. I have the same problem on Windows 7

New Contributor

Re: I keep getting this error: "This add-on could not be downloaded because of connection failure," and I get that at https://addons.mozilla.org/.

it seems FF's fix is outdated. on the https://support.mozilla.com/en-US/kb/Unable%20to%20install%20add-ons page it says to look for xpinstall.enabled under about:config, but it appears xpinstall.enabled does not exist for Windows 7

New Contributor

Re: I keep getting this error: "This add-on could not be downloaded because of connection failure," and I get that at https://addons.mozilla.org/.

neither it does exist for Firefox 5/winxp. Unfortunately, other recommendations in referred kb didn't help. Other suggestions, before going for a reinstall?

New Contributor

Re: I keep getting this error: "This add-on could not be downloaded because of connection failure," and I get that at https://addons.mozilla.org/.

Guys i think i solved this issue Smiley Very Happy All what you have to do is go to about:config then click "I'll be careful i promise" now right click somewhere then click New>String and name it: xpinstall.enabled and set the value to true

All the downloads should work now