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