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Upgrading from Firefox 8 to Firefox 9 on Linux (Ubuntu Lucid) broke a feature I use often: Running multiple instances, then aiming command line Firefox at a specific running instance.

Any ideas on how to fix or work around this?

I run two Firefox instances with separate profiles:

firefox -no-remote -P personal
firefox -no-remote -P work

(The -no-remote is necessary for the second to start a new instance, and not just a new window in the first instance.)

I then use this to open a URL in one of the running instances:

firefox -P personal http://asdf.com

This worked through Firefox 8, but in 9, I instead get the error 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.

Same with these variations:

firefox -P personal -new-tab http://asdf.com
firefox -P personal -new-window http://asdf.com
firefox -P personal -remote "openURL(http://asdf.com,new-tab)"

It looks like the initial -no-remote flag changed in Firefox 9 to also prevent connections from future command lines. If I start an instance without -no-remote, I can successfully open a tab in it from the command line, but I can't start a second instance that way, so that doesn't help much.

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this may be the same problem: bugzilla.mozilla.org/show_bug.cgi?id=703021 –  ryan Dec 30 '11 at 16:02
    
looks like this may have been caused by a "bug fix" in ff9 that made -no-remote also not listen for remote commands, in addition to not reusing a running instance. i'm talking with the mozilla people about it: bugzilla.mozilla.org/show_bug.cgi?id=650078 –  ryan Dec 30 '11 at 16:16
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1 Answer

up vote 1 down vote accepted

jed davis posted a patch that fixes this by splitting a -new-instance flag out of -no-remote. hopefully it will land in an upcoming firefox release.

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Seems to have landed. –  Erika Sep 21 '13 at 10:38
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