Site Blocker Chrome Extension: 10 Features to Look For Before You Install One

A site blocker Chrome extension stops your browser from opening the websites you choose, so the reflex of checking a feed between tasks runs into a wall instead. Almost any blocker can do that much. The useful ones also let you decide when and how a site is blocked, work in Incognito, and are hard to undo in a weak moment. Here are the 10 features to check before you install one, what to look for in any extension's store listing, and how our Website Blocker handles each one. Pro-only features are marked.

Extension: https://chromewebstore.google.com/detail/website-blocker/kniediipngcpmbmpeacaoinhoeipfina

The short answer: what separates a useful site blocker from a basic one

A basic site blocker keeps a list of addresses and closes them. A useful one adds three things:

• Flexible rules. Not every site needs the same treatment. You might block one site all day, allow another for 30 minutes, and block a third only during work hours.
• Friction against yourself. The person most likely to remove a block is you, five minutes later. Passwords, wait timers and browser policies make that harder.
• Coverage where you actually browse. A block that stops working in an Incognito window, or exists in only one of your browsers, is easy to step around.

10 features to check in a site blocker Chrome extension

1. Blocking from the popup in one click

Why it matters: you notice a distraction while you are on it. If blocking it means opening a settings page, you will put it off.

What to check: the popup screenshots in the store listing. The address field and block button should be on the first screen.

How Website Blocker handles it: click the toolbar icon, type the address under Block Websites, choose a Block Type and click Block. The site appears under Recently Blocked Website, and the Running toggle in the header turns all blocking on or off. The one-click blocking page shows the flow in detail.

WebBlocker

English

Running

Block Websites

https://www.youtube.com Block

Block Type

Permanent Block

Attempt Wise Block 3

Reset attempt daily

Time Wise Block

Recently Blocked Website

https://www.reddit.com/

https://www.instagram.com/

Create Password Remove Password

2. Flexible URL matching

Why it matters: sometimes you want a whole site gone, and sometimes only one page, such as a feed, while the rest stays usable. Exact-address-only matching misses other pages of the site; domain-only matching is too blunt.

What to check: whether the listing mentions match modes, wildcards or blocking specific pages.

How Website Blocker handles it: every rule has a Filter URL setting. Contain (the default) blocks any address that contains your text, so "youtube.com" covers every page on the site. Exact blocks only an address that matches exactly, which is how you block one page and keep the rest. You can use "*" as a wildcard (it does not work in Exact mode), and a rule of just "*" blocks every URL except Chrome's internal pages and the extension's own page. Each rule also has a Rule Status On/Off switch, so you can pause a rule without deleting it. See Contain vs Exact filter modes and exact URL rules for examples.

3. Schedules

Why it matters: many sites are fine in the evening and a problem at 10 a.m. A schedule blocks them at set times without you remembering to switch anything on.

What to check: days of the week as well as hours, and more than one time range per day (say, morning and afternoon with lunch free).

How Website Blocker handles it: choose Time Wise Block, then Custom Schedule. In Select days & time, tick the days under Select Days, set a Start Time and End Time, click Add (you can add more than one range for the same day), then click Set Time. Schedules are free. More in scheduled blocking.

4. Time limits and attempt limits

Why it matters: a total ban backfires on sites you sometimes need, like a video site with tutorials. A limit lets you in briefly, then closes the door.

What to check: words like "time limit", "daily limit" or "usage limit", and whether the limit resets each day or only once.

How Website Blocker handles it: Time Wise Block blocks a site After 1 Minute, After 5 Minute, After 10 Minute, After 30 Minute, After 1 Hour or after Custom Minutes, with an optional Reset time limit daily. Attempt Wise Block lets you open a site a set number of times before it is blocked, with an optional Reset attempt daily. Read more about flexible time limits and attempt-based blocking. Our guide to Chrome block websites modes shows which mode suits which habit.

5. Whitelist mode

Why it matters: for exam revision, a child's homework session or deep work, it is easier to list the five sites you need than the thousands you do not.

What to check: "whitelist", "allowlist" or "block everything except" in the feature list.

How Website Blocker handles it: Whitelist mode blocks every website except the ones you allow. Each allowed site can be a Permanent Allow, an Attempt Wise Allow (a set number of opens) or a Schedule whitelist entry (allowed only on certain days and times). It is part of the free version.

6. Incognito coverage

Why it matters: Chrome does not run extensions in Incognito windows by default, so a private window is the easiest way around any blocker.

What to check: whether the help pages explain how to enable Incognito. No extension can switch this on by itself; you allow it in Chrome.

How Website Blocker handles it: open chrome://extensions, click Details under Website Blocker and turn on Allow in Incognito. After that, your rules apply in private windows too. Step-by-step screenshots are on the blocking websites in Incognito page.

7. Resistance to impulsive unblocking

Why it matters: on a computer you control, any extension can be turned off or removed. No blocker can change that, but it can add enough friction that the urge passes first.

What to check: password protection, a delay before the blocker can be switched off, and an official way to stop the extension from being removed.

How Website Blocker handles it: Create Password locks your settings behind a password, with a security question for recovery. Disable Cooldown (Pro) adds a wait before the extension can be turned off. For the strongest setup, such as a child's computer, browser policies can stop the extension from being removed: see the guides for Chrome on Windows (registry) and Firefox (policies.json).

8. A block page you control

Why it matters: a reminder in your own words works better than a generic error, and a redirect can send you straight to something useful.

What to check: a custom block message, a redirect option, and whether you can set them per site or only globally.

How Website Blocker handles it: by default the block page says "Looks like you've reached a dead end". You can replace it with a Custom message or send every blocked visit to a Redirect URL, and a single rule can have its own redirect that overrides the global one. Each rule can also carry an optional Reason (for example "I want to finish my thesis") that is shown on the block screen, and Close blocked page after a number of seconds closes the tab for you. See custom block page messages and redirecting distractions to productive websites.

9. History of blocked attempts

Why it matters: seeing how often you tried to open a site tells you more about a habit than the block itself.

What to check: a log of blocked visits, and the option to turn it off and clear it, which matters on a shared computer.

How Website Blocker handles it: the History page lists blocked visits with the address and the date and time. You can turn history off and clear it at any time. More on block history.

10. Backup, CSV import/export, and Chrome, Edge and Firefox versions

Why it matters: a block list built up over months should not disappear with a new laptop, and if you use Edge at work and Firefox at home, the blocker needs to run in both.

What to check: export and import options, and whether the same extension is listed in other browsers' add-on stores.

How Website Blocker handles it: you can export and import the block list as a CSV file, which also lets you bulk-block websites with CSV import. You can back up all your settings as a JSON file and restore them on another computer. The extension is available for Chrome, Edge and Firefox. It also has dark mode and more than 40 interface languages.

Bonus: Pro-only extras

Everything in the checklist is free except Disable Cooldown. Pro adds four more tools for people who want more control:

• Keyword Blocking: blocks pages whose text or title contains words you choose, even if the address is not on your list.
• Silent Block Mode: closes blocked tabs instantly with no block page, so there is nothing to look at or argue with.
• Block Profiles: separate sets of rules, such as Work, Study and Relax, that you switch with one click.
• Focus Timer: Pomodoro-style focus and break cycles with custom durations, which you can start from the popup.

Privacy and permissions: what a site blocker extension can see

To block a page, any site blocker extension has to see which address each tab is opening, so Chrome shows a permissions warning when you install one. That is normal, but you should know what each permission is for. Website Blocker asks for:

• storage: saves your block list and settings in the browser's own extension storage, on your computer.
• tabs: reads the address of your tabs so it can match them against your rules and close or redirect blocked ones.
• alarms: runs timers for time limits, schedules, daily resets and the Focus Timer.
• notifications: shows short notices, for example when a focus session or break ends.
• A content script on pages: reads page text so Keyword Blocking can work.

You do not need an account to block sites. Your block list stays in the browser. The extension connects to Extfy's own servers for things like checking a Pro license key, loading plan prices and sending a suggestion you choose to submit through the built-in form. When you compare blockers, check that the listing explains its permissions and links to a privacy policy. For background on how browser blockers compare with apps, DNS filters and router settings, see what a website blocker is and how it works.

Free vs paid: is a free site blocker for Chrome enough?

For most people, yes. A free website blocker Chrome extension can cover the whole checklist; paid plans should add extras, not hold back the basics. Here is exactly what the free version and Pro include:

Pro is worth it if you keep switching the blocker off (Disable Cooldown), if your distractions change every week (Keyword Blocking), or if you want separate rule sets for work and study (Block Profiles).

A 2-minute test before you commit

Whatever site blocker you are considering, run this quick test:

1. Install and pin it. On the Chrome Web Store, click Add to Chrome, then Add extension. Pin it with the puzzle-piece Extensions button so the icon stays in the toolbar.
2. Block one real distraction. Block the site you actually lose time on and open it in a new tab. You should see the block page.
3. Try Incognito. Open an Incognito window and visit the same site. If it loads, turn on Allow in Incognito in the extension's Details page and try again.
4. Try to get around it. Open a different page on the same site or the mobile subdomain (m.). Then try to switch the blocker off and note how easy that is. If it takes one click, add a password, and consider a cooldown or a removal policy.
5. Check the message. Add a custom message or a Reason so the block page tells you something useful.

One limit to know before you start: Chrome on Android and iPhone does not run extensions, so no Chrome extension can block sites on your phone. This test, and everything in this checklist, applies to desktop Chrome, Edge and Firefox.

Conclusion

The best site blocker for Chrome is the one you will not switch off on a bad afternoon. Look for one-click blocking, flexible URL matching, schedules and limits, whitelist mode and Incognito coverage first. Then check how hard it is to undo and what it does with your data. Website Blocker covers all 10 in the free version, and Pro adds Disable Cooldown plus the extras above.

Ready to set it up? Follow our step-by-step guide on how to block websites on Chrome, or start from the website blocker extension homepage. If you cannot install extensions on a work computer, see how to block websites in Chrome without an extension.