ReqBlock is a WebExtension for the Firefox internet browser that lets you examine and block Firefox connections to internet sources.

Firefox customers have a few choices relating to blocking sources. They will run an add-on within the browser to dam sources, or configure firewall or hosts file on the working system to take action.

Add-ons that fall within the class are amongst many others the favored NoScript blocker, and any content material blocker corresponding to uBlock Origin or AdBlock Plus.

It could make sense to make use of the firewall or hosts file as an alternative, because it gives some benefits, but in addition disadvantages over utilizing an add-on. The principle benefit is that it blocks the useful resource no matter program that you just use, a drawback that it isn’t as simple to handle the record, or use momentary exceptions.


ReqBlock for Firefox is a model new add-on that you could be use so as to add internet sources to a blacklist to dam connections to those sources.

All this occurs on the choices web page. There you discover the blacklist; merely add, edit or take away entries from it. The modifying works similar to modifying textual content in a plain textual content editor.

I discovered the directions a bit obscure (see screenshot), however including one useful resource per line labored properly.

You possibly can add domains but in addition useful resource names, e.g. /pagead/ with none area. The latter may be helpful if you wish to block a script or useful resource that’s utilized by a number of websites, and never simply by one.

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A click on on the save blacklist button saves the up to date record. It’s instantly lively, and sources that you’ve got added to the record ought to be blocked and never loaded anymore.

You possibly can examine this immediately whenever you load a website that makes use of those sources, for example by opening the Community monitor of the Developer Instruments of Firefox.

The add-on lists all current connections on the choices web page as properly nonetheless, in order that it isn’t actually crucial to take action for verification functions.

firefox blocked connections

The connections are coloration coded. Pink signifies blocked connections, inexperienced connection was allowed.

The extension is easy apart from that. It doesn’t add a button to the toolbar of Firefox, so there isn’t any indication whether or not content material was blocked on a website whenever you load it. This implies as properly that there isn’t any choice to disable the performance simply. The one choice you have got is to disable the add-on within the choices, or to take away entries from the blacklist.

There’s additionally no choice so as to add a component that’s displayed on a website to the blacklist.


ReqBlock blocks connections successfully within the Firefox internet browser, but it surely lacks choices to make the entire course of extra snug. It will possibly nonetheless be helpful to some customers, however largely for blocking sure addresses or internet sources completely in Firefox.

Now You: What’s your tackle ReqBlock? Which add-on do you utilize to dam sources?