screenshotHost Blocker - Block By Domain  |  Download A fast and lite blocker based on domain filtering.

Some of the important features of the Host Blocker - Block By Domain addon are listed below. This is followed by an overview of this addon. This summary contains few words about the addon, its function, and its features. Next is FAQ, this section is useful to get information about how this addon works in your browser. If you couldn't find a specific answer, please fill the bug report form on this page or the contact form on the homepage to let us know about your question. Following the FAQ, is the bug report form. It is designed to collect user feedbacks and bugs about this addon. Users can suggest improvements or feature requests through this form too. The next section is for submitting comments about this addon which uses the Facebook comments plugin. The last section is dedicated to reports submitted through the GitHub website. We hope the information provided on this page, could help you get all the basics you need about this addon and enable you to have a better experience with Host Blocker - Block By Domain.

In short, Host Blocker - Block By Domain lets you block all unwanted URLs based on domain matching, has a whitelist feature to unblock certain domains. Please check the YouTube tutorial below to get an idea of how this addon works in your browser. If you want to contribute to the developement of this addon, please fork it on GitHub, and push your changes to a named branch. Moreover, you can review all the comments made on GitHub commits.

5 Reasons to Use Host Blocker - Block By Domain

  • Allows you to block unwanted domains (based on filtering list).

  • Has several predefined filter lists to choose from (see addon options page).

  • Toolbar button serves as ON|OFF switch to turn the addon on or off.

  • Has a whitelist feature to exclude a domain from blocking.

  • Available for all browsers (Firefox, Chrome and Opera) and platforms (Windows, Linux and Mac).

YouTube Tutorial

This video gives you an idea of how the extension works in your browser.

Matched Content

Frequently Asked Questions

  • 1. What is Host Blocker?

    Host Blocker is a lite multi-browser addon that lets you easily block unwanted domains (hostnames). It has 19 predefined filter lists to choose from. Each list has several rules in it, once you select multiple lists the addon will merge them to construct a single list with unique rules. Once you add this addon to your browser, a button will appear in the toolbar. This button shows that the addon is active (with a red color). Now, before using the addon, please visit the options page and choose desired filter list(s). By default, three lists are selected. Please note that, you can choose to print blocked URLs to the browser console. To do so, please mark the first setting in the options page. If you want to exclude a website from blocking, please add its domain in the designated area within the options page. By default, there are some websites added, but you can edit this list at any time.

  • 2. How can I disable the addon?

    In order to disable the addon, please click on the toolbar icon once. When the color turns to gray, the addon is disabled. Alternatively, you can open the extensions tab in your browser and disable the addon from there. Please note that, once you disable the addon, you need to refresh all open tabs to unblock previously blocked URLs.

  • 3. How can I download the source code for Host Blocker - Block By Domain?

    To download the source code for this extension from Chrome Web Store, it is recommended to use Extension Source Downloader. With this addon, you can download the source code as a ZIP or CRX format to your machine. If you want to download the source code from the Firefox addons store, please open the firefox download link (if available) in the Firefox browser and then right-click on the - Add to Firefox - button and select - Save Link As... - item. Choose the destination folder on your machine and then save the file in XPI format. You can then rename the XPI format to a RAR or ZIP file. Some extensions may have a GitHub repo address, which you can use to download the source code as well. But, it may not be the latest version of the addon. Therefore, downloading the source code from the official web stores is the best option as it always gives you the latest version of the addon.

  • 4. How many blocking lists can I select?

    You can select as many lists as you want, but please keep in mind that, selecting a lot of filtering lists may affect your browsing experience, but this depend on your system speed as well. In the options page, when you select a blocking list, it shows the number of unique rules in it (at the end on the line for settings 2), when you add two or more lists, the number of unique rules will increase. Once the filtering list is constructed, the addon needs to check each URL against all these rules to determine which domain is unwanted. Therefore, when the list is too long, this process will take more time and might affect your browsing experience.

  • 5. How can I add a domain to the whitelist?

    As mentioned above, in order to add a domain to the whitelist, please write the domain name in section 3 within the options page. Please add domains comma separated, for example,,,, etc. When you add a domain in whitelist section, the addon will not monitor that specific domain (and all subdomains). Some domains are added to the list by default, but you can edit this list at any time.

  • 6. How often do these blocking lists get update?

    Whenever the addon gets an update, these lists are updated as well. You can expect to have an update at least once every month.

  • 7. How to uninstall this extension from your browser?

    In order to uninstall, please go to your browser extensions tab, then press on the uninstall button.

  • 8. Does this addon work instantly when I add it to my browser?

    Yes, but when you first add this addon to your browser, please visit the options page to adjust blocking lists. By default, 3 items are selected. Once you select an item(s) from the options page, please reload all open tabs for the addon to take action.

  • 9. How do I unblock a URL (not domain)?

    This addon works based on domain or hostnames. In other words, it only looks at domains or hostnames for any URL. So the whitelisting function only works based on domain matching. Currently, there is no way to whitelist a URL alone, and the whole domain will be whitelisted instead.

  • 10. How can I see all blocked URLs?

    In order to see blocked URLs, please open the browser console. In windows machine please press on the - Ctrl + Shift + J – combination on your keyboard. In MAC, please press on the - Cmd + Opt + J - combination. Then open options page and mark the checkbox next to settings one. Now, reload a webpage to see blocked URL(s) printed in the console. Please note that, keep this option active only if you want to monitor blocked URLs, otherwise it might affect your browsing experience.

  • 11. Is this addon available for Safari browser?

    Unfortunately not. Currently this addon is only available for Firefox, Chrome and Opera browsers. In future, support for Safari will be added as well.


Reporting Bugs

Your feedback goes a long way towards making this addon even better. With this feedback and bug report form, you can report bugs or suggest features/enhancements for the functionality or performance of this addon. Please note that this form will be sent to the developer(s) of this addon. You will not get an immediate or personal response at the moment. However, the developer(s) may contact you through the email address provided in this form for further clarifications or to request additional information regarding the reported bug(s).

If you want to rate or write a review for this addon in the official webstore, please press the - Rate this addon - button below.

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Describe the step-by-step process required to reproduce the issue you are reporting. Be specific when describing these steps by providing as much detail as possible.

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Reviews | Discussions

Please note: keep these reviews/discussions clean, and avoid the usage of derogatory or inappropriate language or terminology in references to individuals or groups based on race, national or ethnic origin, color, religion, age, gender, etc. Do not submit bugs in your reviews, use the above bug-report section instead. Also, never post any personal information in these reviews.