Browser Extensions should carry over to the New Edge Browser in Win 11. Win 11 has a new version of Edge. I store settings for my PC in the One Drive Cloud and when Win 11 installed it also installed the extensions I use. I have 4 devices and settings are shared in the cloud so changes I make to one device such as : Favorites, Browser settings, some windows settings, etc., will happen on my other devices. Option in Accounts Menu to Sync your devices. Anyway, Browser Extensions, etc., are easy enough to re-install if it doesn't carry over to Win 11. Most software will carry over in the Upgrade. If it doesn't then Re-install your software. All my software that worked on Win 10 works also on Win 11. I did a full clean Install of Win 11 Pro on my Dell Tablet. So, I re-installed everything. Using the Win 11 Media Creation Tool during the Install there will be an Advanced option and you have the option to 'keep nothing'. That will give a clean install. And, always back up all personal files and info. The Upgrade option sometimes loses things, as it did for me in Win 10.Get a 64Gb flash drive and copy all personal files, photos, etc. Make sure you run the PC Health Check App. It will tell you if your PC can have Win 11.