A related poser:
I use (or at least, used) Chrome for all my browsing. It was my default browser, and I used it to create a load of shortcuts on my desktop/launcher.
Almost all of these would open in Chrome, except for one which would always open in the built-in Browser! I could never work out why.
(It no longer matters, as I've now switched to Firefox for other reasons. But it did mean that my only contact with the built-in Browser was in frustration…)