Firefox has a inline spellchecker. Unless you have one of the few language locales that comes with a dictionary like en-US you may need to install a dictionary from https://addons.mozilla.org/firefox/language-tools/

https://support.mozilla.org/en-US/kb/how-do-i-use-firefox-spell-checker

I have en-US as the default and misssspellings are not being flagged when editing Substack posts. Oddly, they are flaggedd in this post!

Firefox has a inline spellchecker. Unless you have one of the few language locales that comes with a dictionary like en-US you may need to install a dictionary from https://addons.mozilla.org/firefox/language-tools/ https://support.mozilla.org/en-US/kb/how-do-i-use-firefox-spell-checker

I have this same problem and I'm using en-US but no options are given to correct misspelled word? When I right click I only get a long list of stuff that has nothing to do with the misspelled word.