With Taskade open, click Features in the MacOS menu bar.
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Choose Disable Spell Checker from the drop-down list.
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Click Enable Spell Checker to re-enable the feature.

Click the Taskade Icon in the top-left corner.
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Go to the Taskade tab.
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Click on Settings.
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Toggle Spell Checker.

Go to Settings.
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Click Advanced ➡ Language.
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To the right of Spell check, turn it on or off.

In the Menu bar at the top of the screen, click Firefox.
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Choose "Preferences" from the drop-down menu.
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In the General panel, go to the Language section.
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Uncheck or check Check your spelling as you type.

Click the ··· button in the top-right corner.
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Choose Setting ➡ Languages.
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Under Check spelling toggle spell-checking languages on/off.

Go to Settings.
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Click "Advanced" ➡ Language.
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To the right of Spell check, turn it on or off.