I lost my sketchup file

i can see the file but it only allows me to open it on firefox i was wondering how i can open it on sketchup.

If you can see the file, then you did not lost it. Normally double clicking on the file should open it in an associated application, in this case in Sketchup. Have you been installed the Sketchup actually, or you want to use the web version?
Which operating system (Windows or Mac) are you using?

What operating system? What graphics card? The answers to those questions will help us help you. Please fix your forum profile and the information you included is useless.