Cookie Stuffing: what it is and how to remove it
Cookie Stuffing browser extensions are developed by crooks to insert affiliate IDs into the Internet cookies of specific websites. Most often, these are shopping websites so fraudsters could generate revenue.
Facts checked October 7, 2026. Removal steps tested on Windows 11 (26H2) and checked against Microsoft's and the browser makers' current documentation. Sections marked as our earlier report are the original text: they describe the threat as it was then and have not been reviewed since. The 2026 status, the removal steps and the questions are current.
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Cookie Stuffing: summary
| Distribution | Questionable sites, deceptive ads, freeware installations |
|---|---|
| NAME | Cookie Stuffing |
| TYPE | Adware, browser hijacker, malicious extension |
| SYMPTOMS | Seeing unsearched products on e-commerce websites, and advertisements not originating from the sites you are browsing. Intrusive pop-up ads. Decreased Internet browsing speed. |
| DANGERS | Data gathering about users' browsing activity, links embedded in the search results, and pop-ups can lead to dangerous websites |
| Detection names | No Microsoft detection name is known |
| Removal | Scan the PC with security software to find and remove the malware and anything installed with it. Fortect scans Windows for malware and repairs the system files and settings it damaged. Remove it nowTo use the full-featured product, you have to purchase a license for Fortect. The scan is free. |
Show 8 more facts
| Damage | Not recorded in the old report |
|---|---|
| Name | Cookie Stuffing |
| Type | Search hijacker extension |
| Symptoms | An unknown program in Installed apps |
| Evidence | 5 write-ups by security sites; details still limited |
| Program | Cookie Stuffing |
| First seen | 7 September 2022 |
| Facts checked | 7 October 2026 |
Is Cookie Stuffing dangerous? What it collects
From our report of Sep 2022 · not reviewed since
Cookie Stuffing browser extension can jeopardize user privacy and security
Cookie Stuffing browser extensions are developed by crooks to insert affiliate IDs into the Internet cookies of specific websites.
Most often, these are shopping websites so fraudsters could generate revenue. When a person purchases something, they would earn a commission.
Most often, such plugins are advertised as "handy" tools that can help people save money while shopping, find good deals, coupon codes, etc. However, often the promised functions do not work at all. There is no point in keeping them installed as they can lead to serious privacy and security issues.
From our report of Sep 2022 · not reviewed since
Extension functionalities
Some cookie stuffing extensions can cause push notification spam.
Unfortunately, crooks mainly use rogue advertising networks that place ads leading to dangerous websites. People can end up on scam pages that try to trick them into providing personal information, downloading PUPs (potentially unwanted programs), and even malware.
Malicious plugins may also be capable of managing clipboard data. The extension can operate as a clipboard hijacker. For example, this type of add-on can detect when a user has copied a cryptocurrency wallet address and replace it with an address that belongs to fraudsters when it is pasted.
Even though the primary goal of cookie stuffing is to collect data about shopping sites that people use frequently, the extensions could collect other data, like usernames and passwords, credit card numbers, names, addresses, phone numbers, etc.
Hijacker extensions can change the main browser settings, like the homepage, new tab address, and search engine. This way, people are forced to use only selected channels for browsing. It raises many user privacy and security concerns. Often, the changes remain until the app is completely removed.
From our report of Sep 2022 · not reviewed since
Cookies are used to track user activity
Web-based applications can use cookies to track your browsing activity.
They can store data such as the websites you visit, links you click on, things you type in the search, and what you purchase online. The data can later be sold to advertising networks or other third parties.
From our report of Sep 2022 · not reviewed since
More from our earlier report on Cookie Stuffing
- You can remove an unwanted extension via browser settings or by scanning your system with anti-malware tools
How Cookie Stuffing got into your browser
From our report of Sep 2022 · not reviewed since
Quite often crooks create separate "official" promotional websites for their bogus applications.
There they boast about all the non-existent functions and try to convince people to download them. They may use various social engineering methods to lure people in.
Cookie Stuffing browser extensions may also sneak into the system through fake downloader pages. Do not click on random links and ads even if they seem to be promoting legitimate products, and services.
Most importantly, do not use sites that engage in illegal activities, like Torrent websites, peer-to-peer file-sharing platforms, etc. They are unregulated so they are the perfect breeding ground for deceptive ads, and sneaky redirects. By clicking "Download" on a suspicious page, you may install something completely different than you were expecting.
How to remove Cookie Stuffing
How to remove Cookie Stuffing and get your search engine back
Remove the extension first.
The search settings only stay fixed once nothing on the PC can change them again.
Step 1: Remove extensions you did not add
Cookie Stuffing often works through an extension, so go through the extension list of each browser:
chrome://extensionsedge://extensions- Extensions and themes in Firefox
Switch suspicious extensions off one at a time and reload the page where the problem shows, then remove the one that stops it, and any other you did not add.
Remember the other browsers and profiles on the PC. If Remove is missing or greyed out, a policy forces the extension, which the policy step deals with. Windows 11 and Windows 10 show the same pages.
Chrome on Windows 11: More > Extensions > Manage extensions. Full procedure with screenshots: Remove a browser extension
Step 2: Put the search engine back
Cookie Stuffing replaces the browser's default search engine, so searches pass through its own page first. Chrome: Settings > Search engine > Manage search engines and site search, then Make default on Google, Bing or another engine you chose, and Delete on the entries you never added.
Edge has the same list under Manage search engines (search the Settings page for it), and Firefox under Settings > Search.
Look at On startup and the homepage settings too and remove any address you did not set. Nothing in this step differs between Windows 11 and Windows 10.
Chrome on Windows 11: check Search engine and On startup. Full procedure with screenshots: Reset a browser and fix a hijacked search engine
Step 3: Uninstall Cookie Stuffing
Open Settings > Apps > Installed apps in Windows 11, or Settings > Apps > Apps & features in Windows 10. Sort the list by install date and find Cookie Stuffing, then choose Uninstall from the three-dot menu next to it (in Windows 10, click the entry and then Uninstall).
Remove anything else installed on the same day that you do not recognise, because such programs usually arrive together in one installer. If the uninstaller opens a browser page with an offer or a survey, close it: the program is removed either way.
Full procedure with screenshots: Uninstall a program or app in Windows On uGetFix
Step 4: Reset the browser
Finish the browser part with a reset, which puts the search engine, start page, new tab page and site permissions back to their defaults and switches extensions off. Chrome: Settings > Reset settings > Restore settings to their original defaults.
Edge: Settings > Reset settings. Firefox: Help > More troubleshooting information > Refresh Firefox, which also removes its extensions. Your bookmarks and saved passwords are kept, and the menus are the same on Windows 11 and Windows 10.
Chrome on Windows 11: Settings > Reset settings. Full procedure with screenshots: Reset a browser and fix a hijacked search engine
Step 5: Scan the PC, then run the offline scan
Open Windows Security > Virus & threat protection > Scan options, run a Full scan and remove everything it finds. Then select Microsoft Defender Antivirus (offline scan) and click Scan now: the PC restarts and scans before Windows loads, which finds files that hide while Windows runs.
Save your work first, because the offline scan takes about 15 minutes. Both scans are built into Windows 11 and Windows 10, and a second scanner from another vendor is a useful extra opinion.
Windows 11: Windows Security > Virus & threat protection > Scan options. Full procedure with screenshots: Run a Microsoft Defender Offline scan
Protect your privacy - employ a VPN
There are several ways how to make your online time more private - you can access an incognito tab.
However, there is no secret that even in this mode, you are tracked for advertising purposes. There is a way to add an extra layer of protection and create a completely anonymous web browsing practice with the help of VPN. This software reroutes traffic through different servers, thus leaving your IP address and geolocation in disguise.
Besides, it is based on a strict no-log policy, meaning that no data will be recorded, leaked, and available for both first and third parties. The combination of a secure web browser and VPN will let you browse the Internet without a feeling of being spied or targeted by criminals.
No backups? No problem. Use a data recovery tool
If you wonder how data loss can occur, you should not look any further for answers - human errors, malware attacks, hardware failures, power cuts, natural disasters, or even simple negligence.
In some cases, lost files are extremely important, and many straight out panic when such an unfortunate course of events happen. Due to this, you should always ensure that you prepare proper data backups on a regular basis.
If you were caught by surprise and did not have any backups to restore your files from, not everything is lost. is one of the leading file recovery solutions you can find on the market - it is likely to restore even lost emails or data located on an external device.
From our report of Sep 2022 · not reviewed since
How to remove Cookie Stuffing browser extensions?
You can remove browser plugins by going to your browser settings:
MS Edge (Chromium)
- Open Google Chrome, click on the Menu (three vertical dots at the top-right corner) and select More tools > Extensions.
- In the newly opened window, you will see all the installed extensions. Uninstall all the suspicious plugins that might be related to the unwanted program by clicking Remove.
- Select Menu (three horizontal dots at the top-right of the browser window) and pick Extensions.
- From the list, pick the extension and click on the Gear icon.
- Click on Uninstall at the bottom.
- Open Edge and click select Settings > Extensions.
- Delete unwanted extensions by clicking Remove.
- Open Mozilla Firefox browser and click on the Menu (three horizontal lines at the top-right of the window).
- Select Add-ons.
- In here, select unwanted plugin and click Remove.
- Click Safari > Preferences...
- In the new window, pick Extensions.
- Select the unwanted extension and select Uninstall.
From our report of Sep 2022 · not reviewed since
Check your system for adware
If you think you are infected by a Cookie Stuffing browser extension, and you tried to remove it but were unsuccessful, you should check your system for adware.
If you experience settings changing, pop-ups, and banners appearing, the best option is to use professional security tools like or to make sure you get rid of not only the PUA itself but also all the related files and entries.
The program may not be named the same as the extension, so it can be complicated to identify it. Sometimes developers disguise such apps as system optimizers, antivirus software, or other "handy" tools so users would not suspect them. Anti-malware tools can detect suspicious processes in your machine and eliminate them entirely.
However, if you are sure you know which program is causing the symptoms and manual removal is what you still prefer, we have instructions for Windows and Mac machines:
To fully remove an unwanted app, you need to access Application Support, LaunchAgents, and LaunchDaemons folders and delete relevant files:
- Enter Control Panel into Windows search box and hit Enter or click on the search result.
- Under Programs, select Uninstall a program.
- From the list, find the entry of the suspicious program.
- Right-click on the application and select Uninstall.
- If User Account Control shows up, click Yes.
- Wait till uninstallation process is complete and click OK.
- Click on Windows Start > Control Panel located on the right pane (if you are Windows XP user, click on Add/Remove Programs).
- In Control Panel, select Programs > Uninstall a program.
- Pick the unwanted application by clicking on it once.
- At the top, click Uninstall/Change.
- In the confirmation prompt, pick Yes.
- Click OK once the removal process is finished.
- From the menu bar, select Go > Applications.
- In the Applications folder, look for all related entries.
- Click on the app and drag it to Trash (or right-click and pick Move to Trash)
- Select Go > Go to Folder.
- Enter /Library/Application Support and click Go or press Enter.
- In the Application Support folder, look for any dubious entries and then delete them.
- Now enter /Library/LaunchAgents and /Library/LaunchDaemons folders the same way and terminate all the related .plist files.
Questions about Cookie Stuffing
What is Cookie Stuffing and why is it on my PC?
Cookie Stuffing is a program that was installed on the PC, most likely together with something else you downloaded. Free software sites and many installers add extra programs on setup pages with pre-ticked boxes, so the extra install looks like your choice even though nobody read the page.
Check the install date in Settings, Apps, Installed apps: the program you installed that day is the probable carrier. If you do not need Cookie Stuffing, uninstall it. If it belongs to your hardware or to a program you use, search its exact name and publisher first, because drivers and their tools can have unfamiliar names.
How do I stop programs like Cookie Stuffing from being installed again?
Most unwanted programs arrive through installers, so the fix is in how you install software. Download programs from their official sites or the Microsoft Store, not from download portals or ads above search results. During setup, choose Custom or Advanced installation and untick every extra offer, including browsers, toolbars and optimizers.
Decline update prompts that appear inside other programs unless you know them. In Windows Security, turn on reputation-based protection and potentially unwanted app blocking. These steps would most likely have stopped Cookie Stuffing before it reached the app list.
Should I just switch to another browser?
It may not help. Installers that add hijackers usually target every browser on the PC, and system-level changes such as the hosts file, DNS or proxy affect all browsers at once. A new browser also leaves the hijacker's program and extension in place, collecting data in the old one.
Remove Cookie Stuffing properly first. After that, use whichever browser you prefer; Chrome, Edge and Firefox all let you set and protect your own search engine. Import your bookmarks only after the old browser is clean.
I changed the search engine, but it switched back. Why?
The hijacker is still installed, and it rewrites the setting whenever the browser starts or the extension updates. Changing the setting is the last step, not the first. Find what controls it: the search settings page usually names the extension, and a greyed-out field means a policy.
Remove that source, restart the browser, then pick your search engine and delete the hijacker's entry from the list of saved search engines so it cannot be chosen by accident. Check again after a day, when extensions have had a chance to update.
Will resetting the browser remove Cookie Stuffing?
A reset disables extensions, restores the default search engine, start page and new tab, and clears temporary data and cookies. It keeps bookmarks, history and saved passwords. For many hijackers that is enough.
It does not remove a program installed in Windows, policies in the registry, changes to the hosts file or DNS, or edited shortcuts, so Cookie Stuffing can come back after a reset if one of those remains. Do the reset after removing the program and policies, not instead of it.
Will my antivirus detect Cookie Stuffing?
Not always, because our check found no Microsoft Defender detection name for it. Our check found no Microsoft Defender detection name for it, so a scan may not name it. Update the security program first, then run a full scan instead of a quick one.
Also scan with a second on-demand scanner, because one program can miss what another finds. A clean scan does not prove the signs are gone, so check the browser extensions and installed programs by hand too.
Is Cookie Stuffing a virus?
Not in the strict sense: Cookie Stuffing is unwanted software, classed here as a search hijacker extension, not a self-copying virus. Security programs often label such software as adware, a potentially unwanted program or a browser hijacker.
It still needs removal, because it changes browser settings, shows ads and can lead you to unsafe pages. The larger risk is clicking an ad that leads to a fake update or scam page.
How did Cookie Stuffing get on my computer?
Our report lists the distribution as questionable sites, deceptive ads, freeware installations. Software of this kind often comes bundled with free programs, fake updates or downloads from unofficial sites.
It can also arrive through a browser extension or a notification you allowed on a spam page. Think back to what you installed or allowed just before the first ad or redirect appeared.
Will Fortect remove Cookie Stuffing?
Fortect scans Windows for malware and unwanted programs and repairs the system files and settings they change, and its free scan shows what it finds on your PC before you decide anything.
For Cookie Stuffing, follow the plan above as well: the browser steps take back permissions and settings that no scanner treats as a threat, and uninstalling the program that brought it removes the source.
Run Microsoft Defender's full scan and, if anything was found, its offline scan as a second opinion. If the symptoms are gone after the plan and both scans are clean, there is nothing more to do.
Sources
- Dataprot: What Are Cookies? The Good and the Bad of Browser Cookies (read October 7, 2026)
- Helpnetsecurity: How does a rogue ad network function? (read October 7, 2026)
- Howtogeek: PUPs Explained: What is a "Potentially Unwanted Program"? (read October 7, 2026)
- Malwarebytes: Adware (read October 7, 2026)
- FTC: How to recognize, remove and avoid malware (read October 7, 2026)