Issue: Kicksecure KVM install has netowrk access through cli and manually installed Firefox, however, SecBrowser has no internet access. SecBrowser starts and loads the homepage but fails to load any actual sites. Kicksecure is installed in KVM by following the directions exactly except one extra step which was removing the blkio tune lines from the XML to get the VM to boot.(only way to get machine to boot)
Tor is disabled in SecBrowser. See Tor Browser 10 without Tor - #7 by 2-unglaubig and https://gitlab.com/whonix/tb-starter/-/commit/e986d5f9ac77ad926f20ad37a9920bc58a356b35 and https://gitlab.com/whonix/tb-starter/-/blob/master/usr/share/secbrowser/user.js. Are you using Kicksecure alone or with Whonix-gateway?
See this post: SecBrowser: A Security-hardened, Non-anonymous Browser - DEPRECATED - #175 by Patrick - perhaps this?