Hi, Juanito!
Yes, and many other activities, don't understanding their exact purpose
I saw the icon files in /usr/local/share/netsurf and decided, that something went wrong during build and binary can't find the way to this directory. After several absolutely unsuccessful attempts I got the feeling, that I'm drilling tha air. Then I loaded the working 3.9 version, removed all image files from /usr/local/share/netsurf, and - voila! - nothing changed. Main icons are compiled into the binary, and to heal this the source needs to be patched.
Then I've built gtk3 version of netsurf 3.10 and it works fine and looks fine too. The size is quite the same - around 2.1M - I mean tcz.
Will it be desirable to submit gtk3 version of netsurf? We don't know, when gtk2 version will be repaired.
Thanks for advices and support!