User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; de-DE; rv:1.7.12) Gecko/20050919 Firefox/1.0.7 Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 5.1; de-DE; rv:1.7.12) Gecko/20050919 Firefox/1.0.7 Mainly, I use FF version 1.5 on my machine. For testing purposes, I just installed the new released 1.0.7 version on same computer. I wonder, that these both browser work together on the same computer. I can run firefox 1.0.7 OR firefox 1.5 without any trouble. BUT, if firefox 1.0.7 is opened and I start the firefox 1.5 exe file, it opens another window with firefox 1.0.7 and not firefox 1.5! It seems, that these both versions can't run together. Either, there should be a message that both browser-version can't run together or there should be a fix that you can run both versions together at the same time! Reproducible: Always Steps to Reproduce: 1. open firefox 1.0.7 2. open firefox 1.5 3. a new window with firefox 1.0.7 appears

You can only run 1 Firefox at the same time

This is actually a feature, since you couldn't use both versions (or two instances of the same version) at the same time with the same profile anyway, and showing the profile manager in this case would be confusing to most users. See bug 264181 comment #1. *** This bug has been marked as a duplicate of 264181 *** *** This bug has been marked as a duplicate of 264181 ***