Firefox3 use Firefox2 plug-ins

Firefox3 can download the plug-in Firefox2:
1. Restart Firefox. In the address bar enter: about: config
2. Click "I promise to be careful."
3. Right anywhere, select "New -> string (S)"
4. Enter the name of the first option: general.useragent.override set its value: Firefox/2.0.0.14

 

Firefox3 and then install the plug-in Firefox2:
1. In the address bar enter: about: config click on the "I promise to care"
2. Right, "New -> Boolean (B)", is set to name: extensions.checkCompatibility, setting its value: false
3. Re-create a Boolean value is set to name: extensions.checkUpdateSecurity, setting its value: false
4. Restarting Firefox.

OVER, as simple as that ~