Yes you can! Here's how it works:
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First up, let's open up the Dashboard. To do so, click on the extension:

The Dashboard is Scrab.in's control panel where you'll be able to configure everything you need, but in this case let's focus on Blacklist:
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​Blacklist
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This feature allows you to upload a list of LinkedIn Profiles that you want to avoid visiting. Thanks to this functionality, we will avoid duplicating contacts and / or not contacting those who have formally requested it.
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For this feature to work, you need a CSV file formatted with a column, header and the URLs of the profiles in each row. Here's an example:

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