Block Site

Block Site

A customizable, password-protected website blocker and redirector.

What is Block Site?
'Block Site' is a Firefox extension providing control over website access. It allows you to block unwanted domains, use wildcard or regex matching, utilize reverse mode to limit access only to selected sites, and redirect blocked hostnames to new destinations. Furthermore, it protects against data leakage by preventing certain hostnames from capturing your network activity. Additional features include timed blocking, custom messages on blocked pages, aut0-closure of blocked tabs, killing pop-ups, and configurable pause and resume options.
By: Ray
Version: (Last updated: 2023-10-02)
Creation date: 2017-10-18
Weekly download count: 1,920
Firefox on Android: No
Risk impact: High risk impact
Risk likelihood: Very low risk likelihood
Manifest version: 2
  • activeTab
  • storage
  • notifications
  • alarms
  • contextMenus
  • <all_urls>
  • webRequest
  • webRequestBlocking
Size: 165.56K
URLs: Website
Stats date:

Other platforms

Block Site
Block Site (v0.5.0)
4.36 (234) 80,000
Block Site
Block Site (v0.5.0)
4.20 (35) 51,357
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This extension will block access to websites of your choosing. A master password controls all customization options, as well as access to any blocked site. It’s also possible to redirect navigation from one specific website to another.



  1. Block unwanted domains.
  2. Prevent access to a range of websites using wildcard matching or regular expression matching.
  3. Reverse mode allows access to only some hostnames and blocks access to all others.
  4. Custom redirection; you can redirect a single blocked hostname to a new destination.
  5. Display a custom message on blocked pages.
  6. Time and date based blocking. Only block access to the websites at specified times and dates. This feature can be configured per hostname.
  7. Protect data leakage. This extension prevents certain hostnames from gathering network activity from your computer, since blocking occurs before any network request is emitted to the server.
  8. Auto-closes blocked tabs after a period of time.
  9. Closes annoying pop-ups as soon as the opening request is received.
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User reviews
User reviews summary
These summaries are automatically generated weekly using AI based on recent user reviews. Firefox Browser Add-ons does not verify user reviews, so some user reviews may be inaccurate, spammy, or outdated.
  • Effective in blocking unwanted websites
  • Flexible and customizable
  • Useful features such as password protection and custom messages
  • Difficult to set up
  • Potential privacy concerns and data collection
  • Glitchy and unstable updates
Most mentioned
  • Difficult to set up
  • Privacy and data concerns
  • Glitchy and unstable updates
Recent reviews
excellent at the annoying TEMU PAGE...which is dumbing down the world...quickly and in all versions "killed" !!!! ausgezeichnet bei der lästigen TEMU SEITE...die die Welt verblödet...schnell und in allen Versionen "gekillt" !!!

For years, sites with paywalls have been driving me crazy. Your app has given me a solution. Thank you.
by Alert, 2024-04-10

by power_15, 2024-04-05
View all user reviews
Risk impact

Block Site is risky to use as it requires a number of sensitive permissions that can potentially harm your browser and steal your data. Exercise caution when installing this add-on. Review carefully before installing. We recommend that you only install Block Site if you trust the publisher.

Risk likelihood

Block Site has earned a good reputation and can be trusted.

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