Firefox or Opera Simple Plugin/Extension Create - repost

Hello, i need someone to create a small plugin for me either for firefox or opera and also give me a trick so i can run multi instance of browser to login into multi accounts under one browser. Detail : I have website i will send you private, website contain loading bar, i want you to build me plugin which will put this loading bar timer from 30 to 1 or 0, so instead of waiting for 30 seconds it will instant load within second and credit my account, it is running through javascript, any expert can do it easily and build me plugin. Second thing is there is one more javascript into website, which stop loading bar when i minimize the browser, i want you to add this future as well in plugin so loading bar not stop when minimize browser. And also give me trick or suggestion so i can run multi instance logins within one browser where this plugin will be install, either opera or firefox. Looking forward to reply from you. Project budget is $10 so please donot place more bid then this.