See this: https://malwaretips.com/blogs/remove-esurf-biz/

On the Optional Step 6 in the instructions, you might first want to try a little manual cleanup instead of jumping straight to the Refresh feature. Open Firefox's '''Add-ons page''' using either: * Ctrl+Shift+a * "3-bar" menu button (or Tools menu) > Add-ons * in the Windows "Run" dialog, type or paste <br><code>firefox.exe "about:addons"</code> In the left column, click '''Plugins'''. Set nonessential and unrecognized plugins to "Never Activate". In the left column, click '''Extensions'''. Then, if in doubt, disable (or Remove, if possible) unrecognized and unwanted extensions. ''All extensions are optional; none come with Firefox.'' Often a link will appear above at least one disabled extension to restart Firefox. You can complete your work on the tab and click one of the links as the last step. To '''restore your preferred home page''' please see either of these articles: * [[How to set the home page]] * [[Startup, home page, tabs, and download settings]] Is it all clean now?