Firefox cut off access to the Internet.

Firefox cut off access to the Internet.
In a first time, Firefox completely cut the connection forcing me to restart the Mac OS 10.6.4.
I restored a version of Firefox antecedent using Time Machine than a month old.
Now, the connection problem is only partial and Firefox more accesses to the Internet.
In addition, I must force the software to quit and when I try to restart Firefox, a message tells me that "A copy of Firefox is already open. A single copy of Firefox can be open to both "...?? ?
You said weird? Someone has an idea on how to solve this?
Thank you in advance for your help.

http://www.macobserver.com/tmo/article/airport_utility_setting_wireless_time_lim its

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