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How to Install a Spell Checker Into Mozilla Firefox?
Open Mozilla Firefox Browser on your computer.
Go to Google.com.
make a search for "dictionaries and language packs for firefox".
Link to this page is also given in the Youtube Video Description.
Select the dictionary you would like to use in your Firefox Browser.
Click on the 'Install Dictionary' link next to the dictionary you would like to use.
Now, click on 'Add to Firefox' button.
A pop-up window will appear. Wait for three seconds for 'Install' to become interactive and then click on it.
You may need to restart your Firefox for the dictionary to become usable.
This is How You can Install a Spell Checker into Mozilla Firefox.