Mozilla Firefox問題(急)

Don't be afraid here.

I suggest you following the steps below one by one:

1) Uninstall the whole Mozilla Firefox first.

2) Locate its "exe" file ( i.e. the original execute file you download from website before installation ) and then double click on it.

3) Follow the procedures and then install Mozilla Firebox ( old version ) again.

4) Reboot the machine once and it should function properly.

5) In the future, close its automatic update function so your existing version can be used continuously.

Hope I can help you.