X
Tap here to go to the mobile version of the site.
Your Firefox is out of date and may contain a security risk! Upgrade Firefox

Support Forum

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/.

Posted

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

Chosen solution

Guys i think i solved this issue :D 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

Read this answer in context 12

Additional System Details

Sites Affected

http://

Installed Plug-ins

  • 3D Life Player Beta (4.1.0.78). For more information, visit the 3D Life Player web site.
  • npmnqmp 989898989877
  • Shockwave Flash 10.3 r181
  • Adobe Shockwave for Director Netscape plug-in, version 11.6
  • DivX Web Player version 2.1.1.94
  • DivX VOD Helper Plug-in
  • Next Generation Java Plug-in 1.6.0_26 for Mozilla browsers
  • NPRuntime Script Plug-in Library for Java(TM) Deploy
  • Windows Presentation Foundation (WPF) plug-in for Mozilla browsers
  • getplusplusadobe16291
  • 12.0.1.647
  • RealPlayer(tm) LiveConnect-Enabled Plug-In
  • RealJukebox Netscape Plugin
  • RealPlayer(tm) HTML5VideoShim Plug-In
  • RealNetworks(tm) RealPlayer Chrome Background Extension Plug-In
  • Rhapsody Player Engine Plugin
  • Google Update
  • Adobe PDF Plug-In For Firefox and Netscape 10.1.0
  • The QuickTime Plugin allows you to view a wide variety of multimedia content in Web pages. For more information, visit the QuickTime Web site.
  • Npdsplay dll
  • DRM Store Netscape Plugin
  • DRM Netscape Network Object

Application

  • User Agent: Mozilla/5.0 (Windows NT 5.1; rv:5.0.1) Gecko/20100101 Firefox/5.0.1

More Information

Hasan 477 solutions 5600 answers

-> 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.

feestend 0 solutions 5 answers

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...

Hasan 477 solutions 5600 answers

Unable to install add-ons

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

Check and tell if its working.

Question owner

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.

bobb2001 0 solutions 4 answers

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"

PartyPengy 1 solutions 6 answers

Helpful Reply

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

bobb2001 0 solutions 4 answers

Helpful Reply

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

feestend 0 solutions 5 answers

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

PartyPengy 1 solutions 6 answers

Chosen Solution

Guys i think i solved this issue :D 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

bobb2001 0 solutions 4 answers

nice. gonna try that!

Modified by bobb2001

Hasan 477 solutions 5600 answers

A work around is right-click Click to Download link -> click Save Link As... -> Save the file on your computer -> when it has Downloaded then go to File Menu -> click Open File... -> select the saved file of your add-on (it will be saved as .xpi file) and hit Enter key

Now it should be installed. Check and tell if its working.

Modified by Hasan

bobb2001 0 solutions 4 answers

partypengy's fix worked for me! thanks!

feestend 0 solutions 5 answers

partypengy's fix worked for me too ! thanks Still a weird problem: checked on other PC (also XP/FF 5.0) which has no problem while it has no atttribute xpinstall.enabled as well.

PartyPengy 1 solutions 6 answers

Hmm.... maybe that bug is only on Windows 7 And you're welcome everyone (:

By the way, if you delete the value later it still works

jemrkr 0 solutions 3 answers

Also getting this error. Running Ff 7.0 in Windows XP Home SP3. PartyPengy's solution did not work for me. I even tried restarting Ff after the about:config edit, even though it didn't say you had to. No joy.

Edit: Okay, mha007's workaround worked for me, except in Ff7 the link says, "+ Add to Firefox." Also, to open it, you have to click on the Ff menu button, hover over "New Tab," and then click "Open File...."

Modified by jemrkr

Jaker32 0 solutions 1 answers

I had this problem and it turned out that the date on my computer was set incorrectly. This was preventing Mozilla's site from being "trusted" due to the date on my computer being outside of the range of the beginning and ending dates of Mozilla’s security certificate. So the Add-On would not download.

Check the date on your computer as another possible solution.

Foxi 0 solutions 1 answers

I tried that but it doesn't seem to work!

DavidDivad 0 solutions 1 answers

It works for me, but you need to restart Firefox then try to install the add on again. Hope this will help :-)