Chrome + Firefox + IE + Safari extension

Hello, We are looking for a talented developer to create a really small and simple browser extension, which will be cross browser compatible. The extension needs to be able to do 1 simple task - once installed it has to add 1 j.s code into all web pages loaded in the user's browsers from the point of installation of the exe. The J.S code will be taken from a remote server, a txt file located on a public server. The extension will update once a day the code that needs to be injected. Please PM with examples. Do not bid more then 100$.