Just curious if i have a internet highjacker thingy on my Microsoft Edge Browser.

http//Vosteran was one of 3 pages that were before Google. I deleted them but I still cant open or search the Micro soft Extention store because it keeps saying "this page is not responding" i ran a scan with Bitdefender, and never found anything. I also tried repairing MS Edge and still no luck. I tried switching to Firefox but for some reason it wants me to put in a master pass word from another account and always syncs my data from that account and I have no way of reseting my master password and I cant install firfox without it syncing…So i wanna ask If i should just use Google (so I can use Bitdenders Traffic light and whatever other extension,,,or can I use Opera? is that browser safe? Or what about Mullvad browser? I currently have Bitdefender Premium and thanks for any help :)