How can I enable or disable the spell checker in Mozilla Firefox?

@mike 

To enable or disable the spell checker in Mozilla Firefox, you can follow these steps:

1. Open Mozilla Firefox browser on your computer.
2. Click on the menu button (three horizontal lines in the top-right corner of the browser window).
3. From the drop-down menu, select "Options" or "Preferences" (this may vary based on your operating system).
4. In the "Options" or "Preferences" tab, click on "General" on the left-hand side.
5. Scroll down to the "Language and Appearance" section.
6. In this section, you will find a checkbox labeled "Check your spelling as you type". Checking this box will enable the spell checker, while unchecking it will disable it.
7. Once you have selected the desired option, close the settings tab.

Note: The steps mentioned above are for the newer versions of Mozilla Firefox. If you have an older version, the steps may be slightly different.