On FF desktop it doesn't bother me too much, but on iPadOS Safari I was having quite a challenge editing a URL param due to selecting all on touch with no obvious way to switch to cursor mode (!).
My solution: touch to select all, touch again to reveal sliders, drag the (only visible) left slider to the right to reveal some unselected text, touch the unselected area to get a cursor, touch+hold to drag cursor to end of URL, edit URL, profit! I've seen easier puzzles in puzzle games!
My personal biggest pet peeve: I hate, Hate, HATE that they changed the default behavior of clicks into the address or search bar, from simply "put the cursor here" to "select all". Oh my goodness, do I hate this, even after all these months. It breaks a fundamental behavior of text fields since, I don't know, the beginning of time?
Even today, I don't know how many times I keep inadvertenly deleting the contents of my search bar when all I want to do is add another term at the end. My brain is probably just too old to learn something new, I guess.
Also annoying: with the new add-on system, you cannot even write a plugin to restore the previous sane behavior.