Solved: I was connected to somebody's LAN last week and I had turned off local network access to the browser. Nothing wrong with Openwrt. For somebody running MacOS 
OS X System settings, Privacy and Security, Local Network, flip the slider on for Firefox.
Netgear R6260 upgraded using attended sysupgrade to 24.10.0. It was working fine, I did not do any changes (I think). But now on the lan subnet (bridge device connected to home WiFi) I have lost Luci access. I can still connect using another subnet (Another bridge device connected to separate WiFi) so I know that uhttpd is working fine.
How do I get the access back? Where do I check the logs?
config uhttpd 'main'
list listen_http '0.0.0.0:80'
list listen_http '[::]:80'
list listen_https '0.0.0.0:443'
list listen_https '[::]:443'
option redirect_https '1'
option home '/www'
option rfc1918_filter '1'
option max_requests '3'
option max_connections '100'
option cert '/etc/uhttpd.crt'
option key '/etc/uhttpd.key'
option cgi_prefix '/cgi-bin'
list lua_prefix '/cgi-bin/luci=/usr/lib/lua/luci/sgi/uhttpd.lua'
option script_timeout '60'
option network_timeout '30'
option http_keepalive '20'
option tcp_keepalive '1'
option ubus_prefix '/ubus'