@jackemled
apparently, in the firefox context, “browser chrome” refers to user interface elements
https://stackoverflow.com/questions/4878066/can-i-tell-what-browser-chrome-elements-are-visible-in-firefox
https://devdoc.net/web/developer.mozilla.org/en-US/docs/Tools/Browser_Toolbox.html
@jackemled
but i’ll admit, it’s not a 100% satisfying explanation. the url form chrome:// seems to have a wider set of functions than just in relation to interface elements