Create an Extension/Toolbar

Hi, this is my first time on Freelancer, however have been using [login to view URL] for 4 years, but have had no luck trying to find someone on Odesk, so trying Freelancer for a change. I am looking for someone who can create an extension/toolbar for my shopping website. The Company: [login to view URL] Once completed, the site will have more than 2,500+ companies that offer commission in return for leads/sales. The majority of the sales will go to a charity, hence the site is one large charity search engine. Instead of people having to come to the site and use the search engine on the website, I would like to create an extension/toolbar which the user would simply have to just download, and everytime they are surfing the web, if one of the companies that offer commission/donation show up, it will notify the user. Please NO COPY AND PASTE COVER LETTERS they will not be read! CONTRACTORS JOB 1. To create the extension for Chrome & Firefox 2. Add Analytics Software 3. Help add all the details for the toolbar (retailer details) 4. Help add the toolbar to the website for download (downloads certain version depending on their web browser, I do not know how to do this) 5. Add the toolbar to chrome Apps and any others necessary shops for it to be available on Firefox and Chrome. 6. Easy to for me to Add/Remove Retailers 7. Easy to use Add/Remove new charities 8. Add silent updater 9. Easy to make changes without disturbing the users. 10. Any other small bits. Examples of what I am looking to create are: [login to view URL] & [login to view URL] Thanks and look forward to talking further. Charles