Join the AMA (Ask Me Anything) with the Firefox leadership team to celebrate Firefox 20th anniversary and discuss Firefox’s future on Mozilla Connect. Mark your calendar on Thursday, November 14, 18:00 - 20:00 UTC!

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.

Rohkem teavet

Am trying to download a plug-in, but am unable to download ANY plugins. I keep getting this: Unexpected installation error Review the Error Console log for more details. -203 What can I do to solve this issue?

  • 2 vastust
  • 21 on selline probleem
  • 6 views
  • Viimati vastas Ziggy Maes

more options

I am not able to download ANY plug-ins. All attempts result in the following:

Firefox could not install the file at 

https://addons.mozilla.org/en-US/firefox/downloads/latest/10137/addon-10137-latest.xpi?src=addondetail

because: Unexpected installation error Review the Error Console log for more details. -203

I am not able to download ANY plug-ins. All attempts result in the following: Firefox could not install the file at https://addons.mozilla.org/en-US/firefox/downloads/latest/10137/addon-10137-latest.xpi?src=addondetail because: Unexpected installation error Review the Error Console log for more details. -203

All Replies (2)

more options
more options

Hi slysailr ,

Please take a look at this article Unexpected installation error -203 when installing add-ons , it should help you out with your issue.

Regards, Ziggy