Content blocking & filtering

Blocking has multiple layers — combining them is usually more effective than relying on any single one.

Category blocks

Toggle entire categories on or off in the active focus mode. Each category is a curated, regularly updated list of domains.

Category lists are updated periodically — when a new major site enters a category, we add it. You don't have to maintain these yourself.

NSFW content blocking

Toggle Block NSFW to filter known explicit-content domains. Uses a continuously updated curated blocklist. Covers:

• Explicit content sites
• Known harmful domains
• Content aggregators with adult material

If you find a site that should be on the list but isn't, email [email protected] — we add reported sites within 24 hours.

Real-time keyword filtering

When Block by keywords is enabled in your focus mode, the extension scans page content as it loads and blocks pages containing any of your custom keywords (or built-in ones for known triggering terms).

Useful for:

• Filtering content that doesn't fit a pre-built category.
• Catching new sites that haven't been categorized yet.
• Adding personal trigger words specific to your situation.

See Custom block lists for adding your own keywords.

Image blur

Instead of fully blocking, you can enable Blur filtered images. Page structure stays visible; only matching images are heavily blurred. Useful when you want to see the page but not its visual content (e.g. browsing a forum where most threads are fine but a few have triggering imagery).

Safe search enforcement

When enabled, the extension forces safe search on:

• Google — SafeSearch active.
• Bing — Strict filtering.
• DuckDuckGo — Safe search on.
• Other major engines — equivalent filters.

Works even if the user hasn't enabled safe search at the browser level, and can't be easily overridden while the extension is active. This is one of the most consistently effective filters because so much problematic content is reached through search.

How blocking actually fires

For keyword filtering, the check happens after page load (since the extension needs to read the rendered text), so blocking can be slightly delayed. Image blur applies as images render.

Intervention prompts

If you've enabled Intervention in the focus mode, the extension shows a brief pause prompt before blocking — "Are you sure you want to visit this?" with a configurable delay.

Useful when full blocking feels too restrictive but you want friction. The pause adds enough time for the impulse to fade without removing the option entirely.

Common pitfalls

Next steps

• Custom block lists — your own sites and keywords.
• Strict mode — cooldown so you can't disable blocking impulsively.
• Analytics — what your blocking patterns look like over time.