Chrome Extension Port to Firefox + Add New Feature

I have a pretty simple chrome extension that modifies a couple pages on a video game simulation site. Essentially, it just does some very simple math and toggles html. The details of that plugin project are over here: https://www.freelancer.com/projects/php/Basic-Chrome-Extension-Modify-Existing/details. I'm looking to hire someone to do two things: 1. Add a feature to the plugin. This would modify the html page seen in Screenshot 1. We'd add a toggle button on the right. See Screenshot 2. When clicked, this would look for players in the list with the status set to W, if any, (Screenshot 3) and remove them from the list in Screenshot 1. The averages at the bottom and top right would then adjust accordingly with new averages after the player(s) are removed. See Screenshot 4. When the toggle is pushed again, those players are added back and the original averages are restored. Note: Ideally, we'd want the last toggle state to be saved so that when someone went back to that page, it would be in the same toggle state. 2. Create a Firefox extension based on the Chrome extension. We'd need to make sure the above feature transferred over, as well as making sure the original work we did on another page works as it currently does. See old original project details for explanation there https://www.freelancer.com/projects/php/Basic-Chrome-Extension-Modify-Existing/details. I will provide the files from the original extension that is currently in use. Hope this helps. Thank you!