Firefox freezes when it recieves a "-new-tab" command

Hello,
I am using a c# program to send Firefox some commands.Everything works great, but sometimes when I send a -new-tab command like:
"firefox.exe -new-tab http://www.google.com"
Firefox freezes for few seconds before opening the new tab.I tried removing all the parameters from the command and just send "http://www.google.com" to the system while Firefox is set as the default browser, and the same problem arises again.
I also tried doing the same while Firefox is in safe-mode and still the problem appears sometimes.
How can I troubleshoot this and know what makes firefox freeze for those few seconds?.
Thanks in advance

Hello MahmoudJ,
Thank you for contacting Mozilla Support. This is a really difficult issue and I'm not sure that this is the appropriate place to get assistance with it. Do you have the same results when you open Firefox through a command prompt rather than in your program?
You might have a better chance at getting an answer by posting on Stackoverflow under the Firefox tag. I've linked to their forum below.
http://stackoverflow.com/questions/tagged/firefox
Cheers,
Patrick

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Firefox freezes when it recieves a "-new-tab" command

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