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How can I get rid of the slide on add window that's making me crazy?

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I updated to the latest version of Firefox for desktops today and all of a sudden I'm getting this slide in ad window that slides in from the left and I can't get rid of it! If this keeps up I'll have to stop using Firefox because I really hate this! PLEASE tell me how to get rid of it!

I updated to the latest version of Firefox for desktops today and all of a sudden I'm getting this slide in ad window that slides in from the left and I can't get rid of it! If this keeps up I'll have to stop using Firefox because I really hate this! PLEASE tell me how to get rid of it!

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hello sdean8, the "Define Ext 8" addon in your list of installed extensions looks rather suspicious. please go to firefox > addons > extensions in order to remove the extension.

you also might want to run a full scan of your system for malware with mutliple security tools: Troubleshoot Firefox issues caused by malware

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Sliding windows showed up this week (Oct 10-15). There are two kinds: a shopping site and a survey (from Amazon and Newegg). On Newegg, every time I go to a different area, I get the survey page again. This happens with both Firefox and IE Explorer. You can get rid of them by closing the window, but it is very annoying. Ad and popup blockers don't do the job. Any suggestions?

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hey maxthepug, this sounds like a problem possibly caused by adware on your pc. please go to firefox > addons > extensions & remove any suspicious entries (toolbars, things that you have not installed intentionally, don't know what purpose they serve, etc). also go to the windows control panel / programs and remove all toolbars or potentially unwanted software from there and run a full scan of your system with the security software that you have in place and different other tools like the free version of malwarebytes & adwcleaner.

Remove a toolbar that has taken over your Firefox search or home page Troubleshoot Firefox issues caused by malware

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Note that your System Details List shows that you have a user.js file in the profile folder to initialize some prefs on each start of Firefox.

The user.js file is only present if you or other software has created it, so normally it wouldn't be there. you can check its content with a plain text editor if you didn't create this file yourself.

The user.js file is read each time you start Firefox and initializes preferences to the value specified in this file, so preferences set via user.js can only be changed temporarily for the current session.