Sorry not sure what you mean? This is exactly how Safari, Chrome, and I guess others I can't immediately test work. Seems good to work as expected from other browsers?
They're saying, I think, that the textbox which is a URL is a special textbox but it shouldn't be. It should be the same as any other textbox in Firefox.
> It should be the same as any other textbox in Firefox
Editing strings in `about:config` seems to behave identical to the URL bar, and Ctrl+F behaviour is similar (but other search bars, like in settings, do not highlight all). Possibly more, just did a quick check of the text boxes I remember Firefox's UI having.