Hi guys,

Windows 8 and Firefox have been going along well with each other. While this morning when I click to open firefox, it asked to add new sub-unit, and I refused. Then I click to open it again, a windows pops up to indicate me that Firefox has been opened, and it is opening, enquiry me whether to open again. While there is no further response. I have to click it again.

Do you know what the matter is?

Many thanks!