Q: Can I use the extension from the browser from which I was banned on eBay?
A: While we would have no way of telling you with 100% certainty what would or would not get you banned on eBay again, it's is very possible that they will link you to your old account using your old browser and sometimes even the same computer (as each computer has it's own MAC address that cannot be changed). We do have something that may be beneficial to you and that is Remote Chrome, which will allow you a virtual chrome session where you can run sku grid, the chrome extension, access your eBay account, etc.). Please see this information on setting up remote chrome --> Quick Start Guide to Using Remote Chrome
We also have the ability to list and reprice using file exchange without the chrome extension which may be an option for you as well -- but it too would be a little safer if you're using the private IP provided by remote chrome. Here's information on that -->> How to List, Track and Reprice Your eBay Items Without API and Without the Chrome Extension Using File Exchange Authorization Tokens