Change the Firefox Spell Check Font Format

Change Firefox Spellchecking Style

Want to make your misspelled words stand out a ‘bit more when composing a message in Firefox?  It is easy to do with this quick about:config tweak.  You can select no highlighting, a dotted line, long dots, a single straight line, a double underline or the default squiggly line.

Here is how you can make your spelling mistakes stand out more in Firefox.

  1. Enter About:config in the Firefox address bar. If it pops up an alert, tell it that you know what you’re doing and proceed.
  2. Search for ui.SpellCheckerUnderlineStyle. If you find anything, skip to step 5.
  3. If your system is like mine, you found nothing. That means you have to add this configuration value. Right-click the main portion of the window and select New > Integer.
  4. Now, enter ui.SpellCheckerUnderlineStyle to create a setting by this name.
  5. Now you can set the value of this setting to one of several options: 0 for no highlighting, 1 for a dotted line, 2 for long dots, 3 for a single straight line, 4 for a double underline (like you see above – that’s my pick), and 5 for a squiggly line, which is the default.

Once you are done, you will be able to spell check like no other!  Well, ok – that might be a little dramatic, but you will have a more customized misspelled word notification.

Thanks goes to Download Squad for this amazing find!

View Comments to “Change the Firefox Spell Check Font Format”

  1. xxxevilgrinxxx Jul 31, 2010 at 3:59 pm #

    thanks for adding thisnI think it must have been a default at some point and changed? In any case, it’s good to have it back

  2. xxxevilgrinxxx Jul 31, 2010 at 3:59 pm #

    thanks for adding thisnI think it must have been a default at some point and changed? In any case, it’s good to have it back

  3. xxxevilgrinxxx Jul 31, 2010 at 3:59 pm #

    thanks for adding thisnI think it must have been a default at some point and changed? In any case, it’s good to have it back

  4. xxxevilgrinxxx Jul 31, 2010 at 3:59 pm #

    thanks for adding thisnI think it must have been a default at some point and changed? In any case, it’s good to have it back

  5. xxxevilgrinxxx Jul 31, 2010 at 3:59 pm #

    thanks for adding thisnI think it must have been a default at some point and changed? In any case, it’s good to have it back

  6. xxxevilgrinxxx Jul 31, 2010 at 3:59 pm #

    thanks for adding thisnI think it must have been a default at some point and changed? In any case, it’s good to have it back

  7. xxxevilgrinxxx Jul 31, 2010 at 3:59 pm #

    thanks for adding thisnI think it must have been a default at some point and changed? In any case, it’s good to have it back

  8. xxxevilgrinxxx Jul 31, 2010 at 3:59 pm #

    thanks for adding thisnI think it must have been a default at some point and changed? In any case, it’s good to have it back

  9. xxxevilgrinxxx Jul 31, 2010 at 3:59 pm #

    thanks for adding thisnI think it must have been a default at some point and changed? In any case, it’s good to have it back

  10. xxxevilgrinxxx Jul 31, 2010 at 3:59 pm #

    thanks for adding thisnI think it must have been a default at some point and changed? In any case, it’s good to have it back

  11. xxxevilgrinxxx Jul 31, 2010 at 3:59 pm #

    thanks for adding thisnI think it must have been a default at some point and changed? In any case, it’s good to have it back

  12. xxxevilgrinxxx Jul 31, 2010 at 3:59 pm #

    thanks for adding thisnI think it must have been a default at some point and changed? In any case, it’s good to have it back

  13. xxxevilgrinxxx Jul 31, 2010 at 3:59 pm #

    thanks for adding thisnI think it must have been a default at some point and changed? In any case, it’s good to have it back

  14. xxxevilgrinxxx Jul 31, 2010 at 3:59 pm #

    thanks for adding thisnI think it must have been a default at some point and changed? In any case, it’s good to have it back

  15. xxxevilgrinxxx Jul 31, 2010 at 3:59 pm #

    thanks for adding thisnI think it must have been a default at some point and changed? In any case, it’s good to have it back

  16. xxxevilgrinxxx Jul 31, 2010 at 3:59 pm #

    thanks for adding thisnI think it must have been a default at some point and changed? In any case, it’s good to have it back

  17. xxxevilgrinxxx Jul 31, 2010 at 10:59 am #

    thanks for adding this
    I think it must have been a default at some point and changed? In any case, it's good to have it back

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