Translation of Nominativ

Can you translate: Are you using the firefox browser? Install this tool in your browser window. The ones I suggested the other day are the most useful ones, because we would use it for generic terms which differ from Spanish.
My correction were added and highlighted with yellow markers and attached to this email. Tell me now if you have any questions about grammar rules, since I was a teacher 10 years ago.
As mentioned earlier, much depends on the structure. How do you want to work with us. I am definitely interested in a possible cooperation, and I am open to any suggestions for any solutions.