The feature is on by default and will underline in red any misspelled words.
To choose the correct spelling, right-punch the word and choose from one of the listed options.
To add another language to the Firefox dictionary, right-hit the misspelled word and place the cursor on Languages.
If youve ever used spell check before, youll only see the option for English.
press Add Dictionaries, and Firefox will take you to a page called Dictionaried and Language Packs.
Youll see three columns: Locale Name, Language Packs, and Dictionaries.
choose the language you want to add, and the add-on for that language will appear.
To finish things off, hit theOkaybutton thatll appear after the installation is done.
Now the next time you throw in in that language, you wont have to worry about misspelled words.
Right-click anywhere on the notepad of wherever it is youre typing.
Place the cursor on the Languages option.
When the side menu appears, youll see the different languages.
choose the one you want to select, and thats all there is to it.
press the three-lined menu at the top right and click onSettings.
punch theGeneraloption on the left and scroll until you come across theLanguagesection.
Uncheck the box that saysCheck your spelling as you punch in.
Further Reading
Firefox is not the only online window that has a speck for its users.
Microsoft Word also has acustom Autocorrectctionyou might want to look at.