Firefox Toolbar Plugin

I've already given this job to two service providers and they fell through, so if you bid on this project please make ABSOLUTELY CERTAIN that you can do the job from start to finish. Please make sure to briefly tell me how you will go about completing the project as well. Here is the project: I need a very simple toolbar plugin created Firefox. I have attached an illustration to better explain what I'm looking for. I have also attached one of the previous provider's work. Fixing his work would be preferred. The problem he had was making it possible for me to change all four links and rebuild the xpi file. Also, the .xpi file he rebuilt on his computer (at the bottom of [login to view URL] in "Download Now" link) doesn't install properly. When you click on the link, it says "cannot find install file". Please review all of his files and the website before bidding to make sure you can make everything work and make it possible for me to rebuild the .xpi file properly. I want the installation to initialize and run like the one on this page: [login to view URL] The toolbar will have four buttons, each linking to a different web page. I have already designed the images to appear next to each button as 16px*16px .png files. I will email them to you to build into the toolbar as soon as you begin. It is possible that I will also need assistance making the download now button on my website work. I think I can do this myself, but I might need a little assistance. I will have several future projects for a provider that does good work. I am very easy to get along with and know exactly what I want, so you won't have to worry about doing several hours of work and it not being what I want. I give clear instructions because I know it's the only way to be sure of satisfactory results. If something in this listing was not clear, please ask me a question on the private message board. I will answer it promptly. Thank you all. I look forward to reviewing your bids:) -Ian P.