How to remove One Click Screenshot adware (Firefox Addon Scam)

One Click Screenshot (offered by is a malicious Mozilla Firefox extension which may hijack your default search engine or display pop-up ads and unwanted advertisements on web pages that you visit.

The One Click Screenshot Firefox add-on is promoted via a malicious jаvascript code from, which will force the users to install this unwanted extension. Most often, your browser will be redirect to from a crack, keygen, or adult entertainment site.

The site runs a jаvascript producing a dialog box, telling you you’ll have to “Add One Click Screenshot”. Clicking “Cancel” once changes it to add a tick box marked “Click OK to close this window” Thinking that this is the ticket out of the page, you will tick that box and click “OK”. At this point, your tab will go into “Full Screen” mode, and you will be prompted to install the One Click Screenshot add-on.
The One Click Screenshot Firefox extension blocks the аbout:addons page in background.js by looking for that string in the URL and closing the tab if the string is found. This means that you can’t remove the extension manually without using Firefox Safe Mode or resetting your browser.
A typical behavior for the malicious extensions like the One Click Screenshot Firefox add-on is:
  • Advertising banners are injected with the web pages that you are visiting.
  • Random web page text is turned into hyperlinks.
  • Browser popups appear which recommend fake updates or other software.
  • Your browser homepage and default search may be changed
  • Your browser search queries are being redirected or tracked

This step is needed if the malicious “Something went wrong with your Internet Service” pop-ups will not allow you to close your browser.

Open Task Manager by right-clicking the taskbar and then clicking Start Task Manager. Alternatively to start the Windows Task Manager, you can press Ctrl+Alt+Del and click on Task Manager or simply press on Ctrl+Shift+Esc.

Scroll through the list till you see your web browser’s process and left-click on it once so it becomes highlighted. Once you have selected the browser’s process, click on the End Task button as show in the picture below.

Your browser window should now be closed. The next time you open your browser, do not allow the browser to open the last opened page.

How to remove One Click Screenshot by (Virus Removal Guide)

This malware removal guide may appear overwhelming due to the amount of the steps and numerous programs that are being used. We have only written it this way to provide clear, detailed, and easy to understand instructions that anyone can use to remove malware for free.
Please perform all the steps in the correct order. If you have any questions or doubt at any point, STOP and ask for our assistance.

STEP 1: Reset Mozilla Firefox settings to remove the One Click Screenshot

STEP 1: Reset Mozilla Firefox settings to remove the One Click Screenshot

The One Click Screenshot extension can’t be removed manually because it blocks the аbout:addons page, so to remove it we have two options.
The first option is to run Firefox in safe mode by holding down the Shift key while the browser is starting, then confirm that you want to “Start in Safe Mode” and go to the аbout:addons page. Or, we can restore Firefox to its factory default state while saving your essential information like bookmarks, passwords, web form auto-fill information, browsing history and open tabs.
  1. In the upper-right corner of the Firefox window, click the Firefox menu button, then click on the “Help” [Image: Firefox Help button]button.

From the Help menu, choose Troubleshooting Information.
If you’re unable to access the Help menu, type аbout:support in your address bar to bring up the Troubleshooting information page.

Click the “Refresh Firefox” button in the upper-right corner of the “Troubleshooting Information” page.

To continue, click on the “Refresh Firefox” button in the new confirmation window that opens.

  1. Firefox will close itself and will revert to its default settings. When it’s done, a window will list the information that was imported. Click on the “Finish“.

Your old Firefox profile will be placed on your desktop in a folder named “Old Firefox Data“. If the reset didn’t fix your problem you can restore some of the information not saved by copying files to the new profile that was created. If you don’t need this folder any longer, you should delete it as it contains sensitive information.

News article is edited by: yakura - 7-04-2018, 12:47

Comments 2

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