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When I start nightly, new window of firefox is starts again, so I have to close firefox and start nightly, then if I open firefox Nightly's new window opens. What I am asking is can I run them both simultaneously?

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There are several ways of running to instances of Firefox simultaneously described in the Mozilla wiki:

You can either export MOZ_NO_REMOTE=1 and start firefox (like MOZ_NO_REMOTE=1 firefox or export MOZ_NO_REMOTE=1; firefox) or use the -no-remote argument like firefox -no-remote.

To automatically do this on every login, you can add the export MOZ_NO_REMOTE=1 line to your shells profile file (like ~/.bash_profile).

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thanks but the exporting is not working – pahnin Jun 24 '12 at 11:32
What's the error / unexpected behaviour you're getting? – Wieland Jun 24 '12 at 12:00
I get no error but I cant open Nighlty and Firefox same time – pahnin Jun 24 '12 at 13:05

I think the main problem is that the executable 'firefox' is placed in /usr/bin/ for both. Take a look at this link: http://www.ghacks.net/2011/08/23/how-to-run-firefox-stable-beta-aurora-and-nightly-simultaneously/

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