User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.0; en-US; rv:1.9.0.3) Gecko/2008092417 Firefox/3.0.3 Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 6.0; en-US; rv:1.9.0.3) Gecko/2008092417 Firefox/3.0.3 If I go on facebook for example, normally I just type in facebook in the address bar but now if I don't add the extention I get this jar:file:///C:/Program%20Files/Mozilla%20Firefox/chrome/en-US.jar!/locale/browser-region/region.propertiesfacebook Can someone help as I have not got a clue what to do her Reproducible: Always Steps to Reproduce: 1.type anything in the address bar without the extention on the end Actual Results: I got this File Not Found Firefox can't find the file at jar:file:///C:/Program Files/Mozilla Firefox/chrome/en-US.jar!/locale/browser-region/region.propertiesfacebook. * Could the item have been renamed, removed, or relocated? * Is there a spelling, capitalization, or other typographical error in the address? * Do you have sufficient access permissions to the requested item? Expected Results: gone to facebook

Does the problem also occur in Firefox Safe Mode? http://support.mozilla.com/en-US/kb/Safe+Mode

yes it does

http://mxr.mozilla.org/mozilla-central/source/browser/locales/en-US/chrome/browser-region/region.properties http://mxr.mozilla.org/mozilla-central/source/browser/app/profile/firefox.js#171 http://mxr.mozilla.org/mozilla-central/source/docshell/base/nsDefaultURIFixup.cpp#370 CCing bz and gavin, who have worked on this code.

I guess the "Fall back to a non-localized pref" branch isn't working as intended?

Uh... we shouldn't be hitting the "non-localized pref" branch in this case, since the value of keyword.URL is in fact a properties file. James, a few questions: 1) Does keyword.URL have the value "chrome://browser-region/locale/region.properties" (without the quotes) in your about:config? 2) If you paste the string "chrome://browser-region/locale/region.properties" (without the quotes) in your URL bar and hit enter, does the resulting file contain a line that starts with "keyword.URL="? If so, what does the rest of that line look like?

Bug 453288 has some of the answers to this, but it is the same issue so let's continue there. Note that about:config should display the localized value from the properties file, not the url to the properties.