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I would like to open a new instance of Firefox. I tried

firefox -no-remote

and

MOZ_NO_REMOTE=1 firefox

as detailed in the docs. However I keep getting the message

Firefox is already running, but is not responding. To open a new window, 
you must first close the existing Firefox process, or restart your system.

How can I launch a new instance of Firefox from command line?

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You can use something like firefox -url www.mozilla.com or just firefox www.mozilla.com to open a new instance of the browser in a new window. –  martineau Feb 16 '13 at 20:26
2  
@martineau I dont think you understand "new instance". That is 2 processes of firefox. –  Steven Penny Feb 16 '13 at 20:30

2 Answers 2

up vote 4 down vote accepted

The -no-remote option is used for running multiple Firefox profiles at the same time. You are getting the "Firefox is already running" message because you are trying to open a second Firefox instance with the same profile.

You should be using this option as follows:

firefox -no-remote -P "Another Profile"

or

firefox -no-remote -profile "profile_path"

where profile_path is an absolute or relative (to firefox.exe) path.

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Resetting firefox can fix major problems,and also delete the adwares View more details- http://tech4computers.blogspot.in/2013/11/reset-mozilla-firefox-setting.html

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