Can I emulate previous versions of Firefox within Firefox 4.0?

No it is not possible. It is possible to change the User-Agent string using the Add-on User Agent Switcher but it does not change the behavior of the Javascript engine Having two Firefox versions installed at a time is possible. Just choose a different installation folder.

When running Firefox, use different profiles and pass the no-remote option to prevent a new window being opened with the active Firefox application For example, you can create the profile "firefox36" and "firefox4" and run these using: %ProgramFiles%\Firefox 4\firefox. Exe" --no-remote -P firefox4 "%ProgramFiles%\Firefox 3.6\firefox. Exe" --no-remote -P firefox36.

No it is not possible. It is possible to change the User-Agent string using the Add-on User Agent Switcher, but it does not change the behavior of the Javascript engine. Having two Firefox versions installed at a time is possible.

Just choose a different installation folder. When running Firefox, use different profiles and pass the --no-remote option to prevent a new window being opened with the active Firefox application. For example, you can create the profile "firefox36" and "firefox4" and run these using: "%ProgramFiles%\Firefox 4\firefox.

Exe" --no-remote -P firefox4 "%ProgramFiles%\Firefox 3.6\firefox. Exe" --no-remote -P firefox36.

On OSX you can have multiple versions installed, just make sure each has a different name (e.g. Firefox 3. App, Firefox. App etc).

User profiles will conflict, which is only a pain if FF is your day to day browser. In that case, try MultiFirefox: davemartorana.Com/multifirefox – Jon Hadley Jun 27 at 10:55.

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