Downgrade Firefox [duplicate]

Possible Duplicate:
Where can I find really old versions of Firefox?

How can I clearly downgrade Firefox?

Particularly,need 3.5 version.

Seems that 3.6 has some problems with Firebug for me.

Links for official site downloading page goes to latest 3.6 version any way.

Solution 1:

You can download Firefox 3.5.7 in the older downloads section of the Firefox download page.

i am using firefox 3.6 and it still work with firebug 1.5.

the solutions for downgrade the firefox, you should uninstall the firefox and then you could get old version from filehippo.com