What is one of the most annoying "bug" still reported a thousands time to me but I'm not able to find it here:
Pressing Cmd / Ctrl - F in the Browser and do a "browser based search" for a specific keyword in the sourcecode view, not all but first results are given.

When you first scroll up to end of the code and then doing the same thing, all results are given and iterable via CMD / Crtrl - G (Firefox).

Seems like there is some "page loader" functionalities for "performance improvement" but it's more annoying than helpful.

Perhaps it might be resolved with a correct in-source search: FE-2440