wblz When extension is installed, this suggestion appears in a dark orange background: Package http-interop/http-middleware is abandoned, you should avoid using it. Use http-interop/http-server-middleware instead.
ExZiByte It's not only when an extension is installed its everytime composer references the composer.json file in flarum including during the original install of flarum I have been ignoring it.
marlon luceos Thanks! I encountered the same issue while installing flarum from scratch, so now I'm just ignoring it. hope nothing serious though