Say what an extension is

See what has been added to your browser and take off what you did not choose.

An extension is a small program added to your browser to change how it works — blocking ads, saving passwords.

One can read every page you visit, so keep only the ones you went looking for.

Key points

What to remember

Try this

Open the Extensions list in your own browser and read it. Anything unfamiliar can come off.

Practice: Say what an extension is. Your first lesson is free, with no account or card; the rest are part of a Lantern plan. Interactive lessons require JavaScript.

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