sometimes websites like duckduckgo will add information to the url after loading the webpage. When typing into the address bar and a website tries to redirect or change its url the url of the website is appended to whatever is in the address bar. This is extremely annoying when trying to search things into the address bar because you have to retype everything. This issue is especially prevalent for duckduckgo who changes the website url on every search query. Since searching is a common task this issue affects me hard. I had to create a bug report because it happens so often.