How to Remove “Add Extension to Leave” Pop-up Completely

My Firefox shows the “Add Extension to Leave” pop-up dialog box from a website called “webr.space” when I browse the web. I feel it weird so I dare not to click on the OK button within the box to leave the page. But when I click the Cancel button, another website with other texts pops up on my web browser. I try to close these two pages by clicking on the close buttons of the tabs, but there is no response. Finally, I have to close the browser. But when I restart the browser, the “Add Extension to Leave” pop-up appears from another website again. Why this happens? Has my computer been infected by malware? Please help me!
pop-ups

As a computer user who often surfs the Internet you may receive suspicious pop-ups when browsing the web. Some popups can be closed easily, but some don’t allow you to close them by simply clicking on the X button on its top right corner or the Cancel button. Seeing popups doesn’t always indicate that there is malware on your computer; sometimes, you receive popups is because that you are visiting certain websites designed to display pop-up ads.

However, in some cases, it is really a symptom of malware infection, especially when you keep receiving the some pop-up coming from various websites or different pop-ups coming from a same website. Just as the above problem describes, “Add Extension to Leave” pop-up always appears on the computer – this is a suspicious thing, and it is strongly suggested that the user run a malware scan immediately.

Analysis of “Add Extension to Leave” Pop-up
“Add Extension to Leave” pop-up is a dialog box that comes from various advertising domains on your web browsers, asking you to add extension in order to leave the webpage. It has an OK button and Cancel button in it (see the image below). If you click the OK button, by default you will add some unknown extension on your web browser. But if you click the Cancel button, it doesn’t necessarily mean that you can close and leave the webpage; instead, you may open a new website that contains malicious code. Even though you try to leave the webpage by clicking on the X button of the browser tab, you may fail.

problem_description

What causes “Add Extension to Leave” pop-up? Actually, this pop-up is caused by some adware which can change the settings of Internet Explorer, Chrome, Firefox and other types of web browser without any permission. The adware is created to help prompte some extensions and generate advertising revenue. When it gets installed on your PC, it can alter your browsers’ settings so as to force you to visit various advertising domains that prompt you to install certain browser extensions. It may also modify your browsers’ shortcuts so that each time you open the browsers, you will see the annoying “Add Extension to Leave” pop-up. The adware could also block your access to specific websites by modifying the HOSTS file, install unwanted extensions or toolbars on your web browsers, or redirect you to some dangerous websites from which you may directly download malware programs on your PC. Moreover, it may collect your personal information such as IP address, location, browser type, system version, and online data like search queries, most-visited sites, and clicked ads to analyze your preferences or habits so as to deliver more target advertising content when you are surfing the Internet.

Is it dangerous to receive “Add Extension to Leave” pop-up? Receiving “Add Extension to Leave” pop-up is not the most dangerous thing. If you don’t click on any button or icon within the popup dialog box, your computer will be safe. But this doesn’t mean that you should do nothing.You need to see the essence by the phenomenon – this problem indicates that your computer has got adware infection. You know adware can do a series of bad things on your PC, so you need to take some action to remove the adware immediately. At the same time, it is a good idea that you disconnect your computer from the Internet, so as to avoid some malware being downloaded by the adware on your PC.

Can “Add Extension to Leave” pop-up be removed? This pop-up is generated by JavaScript code embedded in the webpage, so if you want to remove or disable it, you have to do two things: one is to prevent the related Java Script code from running and other other is to remove the adware that modifies your browser settings. In the following, we will give more detailed guides to do these.

How to Remove “Add Extension to Leave” Pop-up Completely
To get rid of “Add Extension to Leave” pop-up, you should, first of all, get rid of the adware hidden on your PC, and then disable the JavaScript on your web browsers. You can follow the guides given below to do that.

Part 1: Remove the hidden adware from your PC.
Below we give the manual removal guide and the automatic removal guide. You can choose to remove the adware either manually or automaitcally, just depending on your own situation. Actually, the manual removal is only for advanced users. If you are a novice user and have no experience of removing malware on your own at all, the automatic removal method should be more suitable for you.

Automatic removal guide:

Considering that there is no exact name of the adware program, it would be a difficult task for you to manually remove it. Therefore, we recommend using an auto malware removal tool called SpyHunter to run a thorough scanning of your computer system so that you can remove the detected adware as well as other exisiting malware threats easily.

SpyHunter is a powerful anti-malware program available in both the free version and registered version. The free version provides the free scan feature that can effectively detect threats like adware, PUPs, browser hijackers, Trojans, worms, and viruses; the registered version provides not only the scan feature but also many other advanced features like malware removal, daily malware definition update, free tech support, etc.
Now you can take the steps below to detect and clean the adware that may cause “Add Extension to Leave” pop-up.

Download SpyHunter setup file on your PC.
Locate the file you have downloaded just now, and double click it to run it.
SpyHUnter installer

When a window pops up, click the Run button.

Select your language and then click OK.

Click CONTINUE button.

Check I accept the EULA and Privacy Policy option and click INSTALL button.
SpyHunter-installation-step-3

SpyHunter is now being installed on your PC.

When the installation is finished, click the EXIT button.

SpyHunter will run automaically on your PC. Now you can run a full system scan by clicking on the Scan Computer Now button.

SpyHunter now is scanning your registry, files, and memory for any existing threats. This scanning process may take 30 minutes or more. Please wait with patience until the scanning is complete.

Once SpyHunter has finished scanning your computer, you will be shown all detected threats. To remove them all, just click the Fix Threats button.

Once all threats are removed, please restart your computer.