For Internet Explorer, click on the gear icon (Tools for Windows XP users) at the top (far right), then click again on Internet Options.
In the Internet Options dialog box, click on the Advanced tab, then click on the Reset button.
In the Reset Internet Explorer settings section, check the Delete personal settings box, then click on Reset.
When IE finishes resetting, click Close in the confirmation dialogue box and then click OK. Close and open IE again.
For Firefox At the top of the Firefox window, click the Firefox button, go to the Help sub-menu (on Windows XP, click the Help menu at the top of the Firefox window), and select Troubleshooting Information.
Click the Reset Firefox button in the upper-right corner of the Troubleshooting Information page.
Firefox will close and be reset. When it’s done, a window will list the information that was imported. Click Finish
For Google Chrome Set the Google Chrome default search engine from search.fbdownloader.com to google.com
Click the Chrome menu button, then select Settings and click on Manage search engines in the Search section.
Select Google (Default) and click on 'Make default' to set Google as your default search engine, then look for: search.fbdownloader.com and click the X sign at the end of the row to remove it from Google Chrome.
Change Google Chrome homepage from search.fbdownloader.com/ to its default. The FbDownloader has modified your Google settings to open its own page whenever you start your browser, so you will need to revert to your chosen homepage.