To create Firefox Mozilla plugin extension for 3.01

Hi, I need to add to firefox plugin collection the plugin like this one [login to view URL] but for new version of Mozilla. So you need to create the plugin for 3.01 with all the same features like Quick Sum but with a different name. Install Quick Sum to test it. Will work with you on a long term basis cause i may need to update the plugin for other future versions of Mozilla. Budget: 40 USD Term: 2 days