I have both Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9a3pre) Gecko/20070313 Minefield/3.0a3p Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.1.3pre) Gecko/20070309 BonEcho/2.0.0.3pre I want to keep BonEcho as my default browser. But Minefield after download/update/restart switch default browser settings, to make itself. And reverse also happens for BonEcho. Expected Result: default browser settings should not be changed without user consent.

I run various trunk builds and branch builds all the time, and this has never happened to me. Is your profile set to prompt you at startup if it isn't the default?

(In reply to comment #1) > Is your profile set to prompt you at startup if it isn't the default? Yes, when start firefox 2/3 by clicking firefox.exe/shortcut_to_it I see this prompt. But not when I do download/update/(auto/manual later)-restart.

Dupe of bug See bug 369314 comment #5 for an explanation as to why this is happening