I just installed Firefox 4 from Firefox 3.6.15. Every time I open the browser, it reverts back to 3.6.15 and I have to reload 4 all over again. What gives?

I installed beta 4 last night. Now, every time I open Firefox it asks me if I want to make Firefox my default browser. I click yes, and it goes to Firefox 3.6.15 and thanks me for upgrading. I have been running 3.6.15 since it was released. I have to reload beta 4 to get back to it again.

I got this all screwed up too.
hmm.. where to start?
3.6 and 4.0 beta - really aren't intended to play well together.
As has been mentioned above, they tend to write over each other.
I managed to get both 3.6.15 and 4.0 beta 12 on the same machine.
But, I had to do it several times.
I got lucky by deleting everything Mozilla, then installing 4.0b12, then 3.6.15 - while making sure that each installed into a separate folder.
I also took care to copy out a couple of BookMark BackUp files - just in case.
My old 3.6# had become so bloated - and, Unstable - for Me, it was time.
The bookmarks were all that I was still interested in.
All the Plugins, Themes, AddOns, etc... had slowed the app to a crawl.
So, I did as complete a wipe of Mozilla bloat code that I could, including profiles.
I then did some registry cleaning.
Then I installed 4.0b12 and 3.6.15.
I can't open them both at the same time.
If I open 3.6.15 first, then open 4.0b12 - the beta comes up as 3.6.15.
If I open 4.0b12 first, then open 3.6.15 - the 3.6 comes up as the beta.
This has a lot to do with both apps sharing the same default profile.
I hope to drop down to one app in the near future.
So, cobbling multiple profiles in order to diddle side by side apps - isn't worth it at this stage.
For me, I can't open FF 4.0b12 when my virus protection is running. PCTools doesn't like some thing about the way FF4.0 wants to phone home when it opens.
So, I can't commit to the 4.0b12, yet.
3.6.15 was crashing on open too - until I uninstalled the feedback addon. - go figure -.
Also, I can't get the 4.0b12 to start in safe-mode with the PCTools antivirus running.
At the rater they are going, I don't see 3.6.# going away any time soon.

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