Originally Posted by stf92
Thanks. Maybe that's in FF 4 but not in 18.104.22.168, unfortunately.
I am using 22.214.171.124 and it is:
Edit -> Preferences -> Advanced -> General -> Check my spelling as I type.
If 126.96.36.199 doesn't have that option, you can download 188.8.131.52 from the Slackware 12.0 patches directory. You can then disable the spelling checker and have a newer version of Firefox also.