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A ruler that overlays a webpage to help you read & retain information. Helpful for people who are neurodivergent. A common technique recommended for people who struggle to read and retain the information as they read is to use a ruler to read every line. This add-on creates a line across the webpage that follows the cursor and darkens the lower half to recreate this technique.
Dec 23, 2025
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Media assets
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Whether the listing includes at least one video.
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Declared language locales.
Developer website
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Listing exposes a contact email.
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Case-insensitive substring match in the name.
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Case-insensitive substring match in the description.
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Count of case-insensitive occurrences in the description.
Category user-count percentile
Share of same-category extensions with fewer users (null if unknown).
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