If Firefox is set as the default browser and any application tries to open a new window, it doesn't work and I get the error "Firefox is already in running... »

Here's what I'm running:
Microsoft Windows 7 Service Pack 1, fully updated to 04/10/2012
New installation of Firefox 11. No add-on enabled following troubleshooting.
I am a user has administrator rights
SAMU is disabled.

For starters, this has happened since Firefox 10 or more. A couple of months now.

I am able to open Firefox. My modules worked (ABP, Flashblock, ABP Element Hiding Helper, IETAB2, Downthemall, Greasemonkey, extension of 4chan) had no problem. Firefox is defined and has been fixed for the past two years as my default browser.

But since about 10 or so, maybe Firefox before, if I opened a session of Firefox and any other application attempts to open a session in a new window, I get the Firefox is already running but not responding do not error. »

I tried to follow the advice of already posted troubleshooting (glance to parent.lock files left [no date], several sessionstore.js [no date] files, create a new user profile, has tried to erase the 'read only' permission in windows 7, but as soon as it is cleared, only read permission back.)

As a last resort, I deleted the Firefox folder, the directory %APPDATA%/Mozilla in its entirety and then used CCleaner to remove all references to Firefox in the windows registry, and then made a complete re - install, without extensions installed right now.

I checked the preferences and have the option "open new windows in a new tab" checked. The problem persists without worrying if this option is checked or not. This problem persists in or out of safe mode, even with the new facility.

Test case:

All cases:
Firefox is selected as the default browser for windows 7

Case 1: Log in to firefox. Use any other program that is trying to open a link to their Web site in a new window browser or the new browser session. "Firefox is already running" error

Case 2: Open a firefox session. Right click on Firefox in the taskbar. Select 'open in new window '. "Firefox is already running" error

Case 3: Open a session of firefox. Select the Firefox Menu > new tab > new window. In fact, a new window opens.

This is the only method of opening a new window in the same browser session or profile that actually works on my system. Attempting to open a browser session from the task bar "open new window dialog" or opening a new window while a current window/session is running will not open firefox in a new window or a new tab in the current session. The "Firefox is already running, but is not responding" error will occur every time.

Make sure that you do not start Firefox with the - No.-remote switch or have defined the MOZ_NO_REMOTE = 1 environment variable (Control Panel > system > advanced > environment variables).

Tags: Firefox

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