Downloading Chrome extension from Smumi.club might be dangerous

Smumi.club is a dangerous website that spreads a suspicious Google Chrome extension. Users might be redirected to this site when browsing on high-risk Internet sites or by an adware[1] program hiding on the computer.
This suspicious website has malicious JavaScrip code that triggers a pop-up notification as soon as a person enters it. The pop-up looks like an ordinary Chrome alert. However, it’s not.
It claims that users have to install an extension in order to leave the site. Indeed, you may not be able to close browser’s tab. However, instead of clicking “Cancel” button or checking the tick on “Prevent this page from creating additional dialogs” box, you should force-quite the browser.
These two buttons will not help to run away from Smumi.club adware. For instance, if you mark the checkbox, Chrome will go into full-screen mode, and you will be aggressively forced to install this extension.
This cyber infection might attack computer users all over the world, including the United Kingdom,[2] Canada, and countries in Europe or Asia.
Installation of this add-on may lead to various browsing-related problems:
- homepage and search engine changed to an unknown domain;
- increased amount of online ads;
- redirects to suspicious websites.
This ad-supported application is capable of employing a virtual layer. It allows placing various third-party commercial offers on all visited websites. It might deliver banners, pop-ups or turn text into hyperlinks.
Smumi.club might deliver ads that inform about detected viruses, offer to install updates or software. We want to point out that this content is fake and might be dangerous.
PUP might also redirect to websites that promote useless, suspicious or even malicious software. Thus, you can be tricked into installing a dangerous Trojan.[3]
If you find yourself on a strange Internet site that asks to install unknown applications, leave it immediately. Do not click any buttons, just close the browser. Then start Smumi.club removal with FortectIntego or another security program.
Running a full system scan with anti-malware tool will help to identify cyber infection and delete it. Once it’s done, you should not encounter any suspicious ads or be disturbed by redirects to high-risk websites.
However, if you would like to remove Smumi.club manually, scroll down to the end of the article. There you will find an illustrated step-by-step guide.

Redirects to dangerous sites might start after freeware installation
You might be redirected to this site when you are visiting potentially dangerous websites, such as adult or gambling sites. It goes without saying that you should stay away from such online places.
However, redirects might also be triggered by an adware program. This PUP might be added in software bundles and travel as an optional component.
The Smumi.club hijack might occur when freeware or shareware is installed under Recommended or Standard installation mode. These settings are designed to download extra applications without asking direct permission.
We recommend getting used to installing free programs under Custom/Advanced settings that show the list of third-party programs. However, you can unmark all the pre-selected entries and in this way stop PUPs from entering the system.
Guidelines for Smumi.club virus elimination
There are two ways how you can remove this potentially unwanted application from the computer. The first method is called manual and requires investigating the system.
To remove Smumi.club entirely, you need to locate and delete adware-related components. The application responsible for generating ads and redirects might show up in the list of installed programs.
However, if you cannot find anything suspicious, you need to go to Chrome’s extensions. Possibly, there you will find unknown add-ons. Thus, uninstall them all.
Detailed Smumi.club removal guidelines you can find below. However, if you are interested in automatic removal option, you have to install a reputable security program. Update it and scan the system.
Uninstall from Windows
Uninstall from Windows 10/8:
- Type Control Panel into the Windows search box and open the result.
- Under Programs, select Uninstall a program.

Uninstall from Windows 7/XP:
- Click on Windows Start > Control Panel (Windows XP users should click on Add/Remove Programs).
- In Control Panel, select Programs > Uninstall a program.

Remove the unwanted program:
- In the Programs and Features window, look for any recently installed suspicious entries, select them, and click Uninstall.
- If User Account Control appears, click Yes to confirm, then complete the removal.

Delete from macOS
Remove the unwanted application:
- From the menu bar, select Go > Applications.
- In the Applications folder, look for any suspicious entries, then drag them to Trash (or right-click and pick Move to Trash).

Delete leftover files and folders:
- Select Go > Go to Folder.
- Enter /Library/Application Support and remove any suspicious folders related to the unwanted program.
- Repeat the same check in the /Library/LaunchAgents and /Library/LaunchDaemons folders, deleting any suspicious entries.

- Finally, empty the Trash to permanently remove the leftovers.
Reset Internet Explorer
Remove dangerous add-ons:
- Open Internet Explorer, click on the Gear icon (IE menu) on the top-right corner of the browser
- Pick Manage Add-ons.
- You will see a Manage Add-ons window. Here, look for suspicious plugins. Click on these entries and select Disable.

Change your homepage if it was altered:
- Open IE and click on the Gear icon.
- Select Internet Options.
- In the General tab, delete the Home page address and replace it by your preferred one (for example, Google.com).
- Click Apply and then select OK.

Delete temporary files:
- Press on the Gear icon and select Internet Options.
- Under Browsing history, click Delete...
- Select relevant fields and press Delete.

Reset Internet Explorer:
- Click on Gear icon > Internet options and select Advanced tab.
- Select Reset.
- In the new window, check Delete personal settings and select Reset.

Remove from Microsoft Edge
Delete unwanted extensions from MS Edge:
- 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 Remove.

Clear cookies and other browser data:
- Click on the Menu (three horizontal dots at the top-right of the browser window) and select Settings > Privacy, search, and services..
- Under Clear browsing data, pick Choose what to clear.
- Select Cookies and other site data and Cached images and files. (apart from passwords, although you might want to include Media licenses as well, if applicable) and click on Clear.

Restore new tab and homepage settings:
- Click the menu icon and choose Settings.
- Then find On startup section.
- Click Remove next to any suspicious startup page.
Reset MS Edge if the above steps did not work:
- Press on Ctrl + Shift + Esc to open Task Manager.
- Click on More details arrow at the bottom of the window.
- Select Details tab.
- Now scroll down and locate every entry with Microsoft Edge name in it. Right-click on each of them and select End Task to stop MS Edge from running.

Instructions for Chromium-based Edge
Delete extensions from MS Edge (Chromium):
- Open Edge and click select Settings > Extensions.
- Delete unwanted extensions by clicking Remove.

Clear cache and site data:
- Click on Menu and go to Settings.
- Select Privacy, search and services.
- Under Clear browsing data, pick Choose what to clear.
- Under Time range, pick All time.
- Select Clear now.

Reset Chromium-based MS Edge:
- Click on Menu and select Settings.
- On the left side, pick Reset settings.
- Select Restore settings to their default values.
- Confirm with Reset.
- This will disable extensions and reset startup pages but will not delete bookmarks, saved passwords, or browsing history.

Remove from Mozilla Firefox (FF)
Remove dangerous extensions:
- 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 the unwanted extension and click Remove.

Reset the homepage:
- Click three horizontal lines at the top right corner to open the menu.
- Choose Settings.
- Under Home, set your preferred homepage and new tab settings.
Clear cookies and site data:
- Click Menu and pick Settings.
- Go to Privacy & Security section.
- Scroll down to locate Cookies and Site Data.
- Click on Clear Data...
- Select Cookies and Site Data and Temporary cached files and pages, then click Clear.

Reset Mozilla Firefox
If clearing the browser as explained above did not help, reset Mozilla Firefox:
- Open Mozilla Firefox browser and click the Menu.
- Go to Help and then choose Troubleshooting Information.

- Under Give Firefox a tune up section, click on Refresh Firefox...
- Once the pop-up shows up, confirm the action by pressing on Refresh Firefox.

Remove from Google Chrome
Delete malicious extensions from Google Chrome:
- 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 suspicious extensions related to the unwanted program by clicking Remove.

Clear cache and web data from Chrome:
- Click on Menu and pick Settings.
- Under Privacy and security, select Clear browsing data.
- Select Browsing history, Cookies and other site data, as well as Cached images and files.
- Click Clear data.

Change your homepage:
- Click menu and choose Settings.
- Look for a suspicious site in the On startup section.
- Click on Open a specific or set of pages and click on three dots to find the Remove option.
Reset Google Chrome:
If the previous methods did not help you, reset Google Chrome to eliminate all the unwanted components:
- Click on Menu and select Settings.
- In the Settings, scroll down and click Advanced.
- Scroll down and locate Reset and clean up section.
- Now click Restore settings to their original defaults.
- Confirm with Reset settings.

Delete from Safari
Remove dangerous extensions:
- Open Safari, click Safari in the menu at the top-left of the screen, and select Preferences.
- Go to the Extensions tab, look for any suspicious entries, and click Uninstall to remove them.

Clear history and website data:
- Click Safari in the menu and pick Clear History.
- Set Clear to all history and confirm with Clear History.

Reset Safari:
- Click Safari in the menu and select Preferences > Advanced.
- Enable Show Develop menu in menu bar.
- From the menu bar, click Develop and select Empty Caches.

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