develop addon to borwser that changes default search engine

I need an addon to Internet explorer , firefox , chrome that changes the browser's default search engine with my url ## Deliverables [login to view URL] requirements notice: As originally posted, this project does not have complete details. Should a dispute arise and this project go into arbitration "as is", the contract's vagueness might cause it to be interpreted against you, even though you were acting in good-faith. So for your protection, if you are interested in this project, please work-out and document the requirements onsite.