With Taskade open, click Features in the MacOS menu bar.

Choose Disable Spell Checker from the drop-down list.

Click Enable Spell Checker to re-enable the feature.

Go to "Settings."

Click "Advanced" ➡ "language."

To the right of "Spell check," turn it on or off.

In the Menu bar at the top of the screen, click "Firefox."

Choose "Preferences" from the drop-down menu.

In the "General" panel, go to the "Language" section.

Uncheck or check "Check your spelling as you type."

Click the "···" button in the top-right corner.

Choose "Setting" ➡ "Languages".

Under "Check spelling" toggle spell-checking languages on/off.

Go to "Settings."

Click "Advanced" ➡ "language."

To the right of "Spell check," turn it on or off.