Back in the day when I was running Gentoo, in the long long ago, Firefox was one of the few things I installed as a binary, since compiling it took hours. Compiling it every time there was an update would have driven me crazy. From what I gather this is still true for most users. Yeah, go for the Flatpak if at all possible.
LibreWolf is available as Flatpak. Building it from source probably will take hours and hours.
Back in the day when I was running Gentoo, in the long long ago, Firefox was one of the few things I installed as a binary, since compiling it took hours. Compiling it every time there was an update would have driven me crazy. From what I gather this is still true for most users. Yeah, go for the Flatpak if at all possible.