Www.qian14.cn finally solved this problem

Install a plug-in today. After the installation is complete, when you open ff, you will find a very strong scene,
Open the IE window for Firefox.
I found a solution on the Internet.

Code
Click "start" and "run"
Enter regedit
Enter the Registry
Click "edit"> "Search" in the above menu"
Enter qian14
Find the first one, you can double-click the key value on the right, delete the tail "http://www.qian14.cn"
F3 key to continue searching
At this time, find the following HKEY_LOCAL_MACHINE \ SOFTWARE \ Microsoft \ Windows NT \ CurrentVersion \ Image File Execution options:
The left side is the Firefox primary key, and the right side is the key value containing qian14.cn
Debuger item in empty firefox.exe.