Is spell-checking done locally on my computer, or is it done on the Mozilla website? I just found out that the Chrome and Edge browsers send my typed message to the home office, and that is where the spell-checking is done. Can I assume that this process is done locally on my own computer with Firefox? I've been paranoid about security for many years, and every little bit of info I can add to my personal well-being lets me sleep that much better at night. I am currently 82 years of age and have been using Firefox since it first became available, just because of its advertised security features. Quite happy with it and hope it stays on top of my needs. And I have the same question regarding Thunderbird and its security properties. Thank you. Bob ([removed email from public support forum])