Most website blockers for Firefox work the same way: you give them a list of addresses, and those addresses stop loading. That is the right tool for some jobs. It is a clumsy one for the sites that people actually fight with, because most of us do not need Instagram, YouTube or Reddit gone. We need the bottomless part gone. A site blocker that locks you out of your DMs, your subscriptions and the one video you needed gets switched off by Thursday. If you searched for a "Firefox website blocker" or ways to "block a site on Firefox", this guide covers a different approach: block the feed, not the site, and add time limits for the rest.
Quick answer: The free Stillfeed extension for Firefox removes the endless-feed surfaces on eight sites and keeps the parts you use. It also has a daily limit, a session timer, quiet hours and a pause before opening that close sites when your time is up. The Firefox install is signed and takes one click.
Why blocking a whole site often fails
A pure site blocker is a binary: the site loads or it does not. The trouble is that the modern social site is two products stapled together. One is the thing you wanted: a message from a friend, a lecture on YouTube, a thread about a bug. The other is a recommendation engine whose job is to keep you from leaving. When you block the whole site you lose both, and the first time you need the useful half, you pause the blocker. After that it is easy to leave it paused.
There is a second problem. Blocklists are about willpower at the moment of opening. You have decided at 9 in the morning that Reddit is off limits, and by 3 in the afternoon you are tired and the block feels like an obstacle, not a help. A tool that removes the part designed to trap you, and leaves the rest, asks much less of your future self.
Blocking the feed instead
The Stillfeed extension works on the page in your Firefox. For each supported site it hides or redirects the surfaces built around endless recommendation, and it leaves messaging, profiles, search and the posts you open. The core hiding for each site is on by default, and you can switch any site off from the toolbar popup.
The extension also tells you when it cannot do something. Where a control is not available on a site yet, the popup says "Not available yet" instead of showing a switch that does nothing.
What it hides, site by site
- Instagram: the Reels page and single reels are sent to your home page, Reels in the left menu are hidden, Reels in your feed are collapsed, suggested posts are collapsed (English only) and the Explore grid is hidden. Search still works.
- YouTube: the Shorts menu entry and Shorts shelves are hidden, and Shorts pages are blocked.
- X: the home timeline opens on Following, the Trending page is sent home, and trends and Today's News in the right column are hidden.
- Reddit: r/popular and r/all are blocked.
- Facebook: Reels and Watch pages are sent home, and the Reels tab, menu entries and feed shelf are hidden.
- TikTok: For You, Explore, LIVE and Short dramas are hidden in the menu, and you are sent to Following.
- LinkedIn: My Network is sent to the invitation manager, Games to your feed, and sponsored posts are removed from your feed (English only).
- Snapchat: Stories, Spotlight and Lenses are hidden in the top menu, and you land in Chat.
Some extras are off until you turn them on, where the site supports them: hiding sponsored posts on X and Reddit, hiding likes and counts on YouTube, X and TikTok, hiding comments on YouTube, X and Reddit, word filters on X, Reddit and LinkedIn, and a media filter on X, Reddit and LinkedIn. Some features read a site's labels in English, so they work on English-language versions.
Closing sites with time limits
Hiding the feed is half the job. The other half is the minutes, and this is where the extension starts to look like a website blocker. The time tools work on all eight sites.
- Daily limit. Set a total for the day. When it is used up, the sites close until midnight. You can add 5 more minutes once per visit.
- Session timer. Choose 2, 5, 10 or 15 minutes per visit, with the same single 5-minute extension.
- Quiet hours. Named schedules that close chosen sites on chosen days. Overnight windows work, so you can close a site from late evening to morning.
- Pause before opening. Wait 5 or 10 seconds before a site loads.
- Grayscale. Drains the colour from the page so scrolling is less rewarding.
Quiet hours are the closest thing to a classic blocklist. If you want Reddit shut during work, create a schedule called "Work", pick Reddit, set the weekdays and hours, and the site closes then and reopens afterwards. Unlike a permanent block, it gives the site back on your terms.
Installing it on Firefox
Firefox has the easy path. Stillfeed is on Firefox Add-ons, and the extension page links it. It adds in one click, Firefox keeps it updated, and it needs Firefox 128 or newer.
After it installs, pin the icon from the extensions menu in the toolbar. The popup lets you switch each site on or off, and the options page holds the time tools.
If you use more than one browser, note that the settings and the time limits apply in the browser where the extension is installed. Chrome, Brave, Edge, Opera and Arc install it from the Chrome Web Store, linked from the same page.
What it can see
A blocker needs permission to run on the sites it works on, so it is reasonable to ask what that means. The extension's host permissions are limited to the eight sites it covers. Everything runs inside your browser. It has no account and no analytics, makes no network requests of its own, and ships its hiding rules inside the package. Your settings and your minutes of use stay on your computer. Its privacy section says the same in more detail.
What it will not do
This is not a general-purpose blocklist. You cannot add an arbitrary address to it, and it covers eight named sites, so if you want to block a news site or a shopping site, you still need a classic blocker, and the two can run side by side. It also does not stop you from opening another browser, and it does not reach your phone. The time limits are a friction layer for the automatic habit, not a lock for someone determined to get around them.
For LinkedIn in particular, where you may want the feed gone but not the job search, see LinkedIn without the feed. For a comparison with a tool that adds a pause before opening an app on iPhone, see Stillfeed vs one sec.
On your phone
For iPhone there is the Stillfeed app, a free in-app browser that hides the same kind of feeds. It is on the App Store.
Common questions
Can I block a site on Firefox without an extension?
Firefox has no built-in blocklist for ordinary users. Parental controls and operating system settings can block addresses, and an extension is the usual route for anything that runs inside the browser.
Does it block the whole site?
No, by default it hides the feed surfaces and keeps the rest. The daily limit and quiet hours are the tools that close a whole site, for the times you choose.
Is the Firefox install safe?
The Firefox file on the extension page is signed, which is what makes a one-click install possible. The extension requests permission to store its settings, to run one repeating one-minute timer for counting use, and to apply its hiding rules on the eight supported sites.
Does it work in Firefox Private Windows?
Firefox only runs extensions in private windows if you allow it for that extension in its settings. If you want it there, turn that permission on in Firefox's add-ons manager.
Is it free?
Yes. No account, no trial and no sign-up.
Ready? Get the extension. On Firefox it is one click.
More browser extension guides
- How to Block YouTube Shorts on Chrome (and Other Desktop Browsers)
- How to Set a YouTube Time Limit in Chrome (and Other Desktop Browsers)
- Unhook YouTube Extension vs Stillfeed: What Each One Does
- Instagram on a Computer Without Reels, Explore or Suggested Posts
- How to Hide Reels on Facebook on a Computer
- Snapchat Web: Use It for Chat Only, Without Stories or Spotlight
- How to Block a Website in Chrome (and When You Only Want the Feed Gone)
- News Feed Eradicator Alternative: Hide Feeds on 8 Sites, Plus Time Limits
- How to Block r/popular and r/all on Reddit in Your Browser
- Block Distracting Sites on Edge, Brave, Opera and Arc (Free Extension)
