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

@pietro 

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

1. Open Mozilla Firefox on your computer.
2. Click on the three horizontal lines located in the top-right corner of the browser window. This will open the Firefox menu.
3. From the menu, click on "Options." This will open the Firefox Options page in a new tab.
4. In the left sidebar of the Options page, click on "General".
5. Scroll down to the "Language and Appearance" section.
6. Under "Language and Appearance," you will find a checkbox labeled "Check your spelling as you type." By default, it is checked, indicating that the spell checker is enabled.
7. To disable the spell checker, simply uncheck the "Check your spelling as you type" checkbox.
8. To enable the spell checker, check the checkbox again.

The spell checker in Firefox will now be enabled or disabled based on your selection.