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.

Avatar for Username

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

Echekwara usoro a. Biko jụọ ajụjụ ọhụrụ ma ọ bụrụ na ị chọrọ enyemaka.

I tried to download the Firefox Add on Web Developer and I got an error message and I don't know how to proceed.

  • 1 nzaghachinzaghachi
  • 4
  • 5 views
  • Nzaghachi ikpeazụ nke cor-el

ErinGrieger
ErinGrieger
more options

Hi I have Firefox 3.0.1 and then it also says Mozilla 5.0. So first I don't even know if this is the right product but I didn't know what else to do.

I'm trying to I tried to download the Firefox Add on Web Developer and I got an error message of: Firefox could not install the file at http://releases.mozilla.org/pub/mozilla.org/addons/60/web_developer-1.1.9-fx+sm.xpi because: Unexpected installation error Review the Error Console log for more details. -203

I've tried it like 3-4 times. I don't know what I'm doing wrong. Any suggestions???

THANK YOU :-) Erin

Hi I have Firefox 3.0.1 and then it also says Mozilla 5.0. So first I don't even know if this is the right product but I didn't know what else to do. I'm trying to I tried to download the Firefox Add on Web Developer and I got an error message of: Firefox could not install the file at http://releases.mozilla.org/pub/mozilla.org/addons/60/web_developer-1.1.9-fx+sm.xpi because: Unexpected installation error Review the Error Console log for more details. -203 I've tried it like 3-4 times. I don't know what I'm doing wrong. Any suggestions??? THANK YOU :-) Erin

All Replies (1)

cor-el
cor-el
  • Moderator
  • Top 10 Contributor
more options

You should update to the latest Firefox 3.6.x version:

See: