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Unable to open a second firefox window if i have already a firefox window running

  • 3 replies
  • 15 have this problem
  • Last reply by cor-el

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I'm unable to open a new firefox window if i have one already running. Previously this action was allowed. so i would like to ask if this action has been disallowed after the update ?

All Replies (3)

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You have a corrupted Firefox 3.6.12 user agent (Firefox/

Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv: Gecko/20101026 Firefox/

See *

Check the general.useragent prefs on the about:config page. You can open the about:config page via the location bar, just like you open a website. Filter: general.useragent If any general.useragent prefs are bold (user set) then right-click that pref and choose Reset.

Are you starting Firefox with the -no-remote command line switch?

Make sure that you do not start Firefox with the -no-remote switch or have set the environment variable MOZ_NO_REMOTE=1 (Control Panel > System > Advanced > Environment variables).

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thanks for the reply.i tried following the steps and did every thing.but i still cant open a second window.

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Start Firefox in Troubleshoot Firefox issues using Safe Mode to check if one of your add-ons is causing your problem (switch to the DEFAULT theme: Tools > Add-ons > Themes).

  • Don't make any changes on the Safe mode start window.

See Troubleshoot extensions, themes and hardware acceleration issues to solve common Firefox problems and Troubleshoot issues with plugins like Flash or Java to fix common Firefox problems