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Click the Firefox menu and select Add-ons. Select Extensions in the Add-ons window. Click the Remove button next to the entry to remove the MyStart toolbar. Click the Search engine icon next to the Search field in the Firefox window. Select Manage Search Engines from the menu. Click on MyStart Search and click the Remove button. Click the Firefox menu and select Options. Select the General tab. Change the address in the Home Page field to whatever you wish. Enter the address "about:config" into the address bar and press Enter. Confirm that you want to continue and then enter "mystart" into the Search field that appears. This will display a list of preferences that were changed by MyStart. Right-click on each one and select Reset. Click the Firefox menu, hover over History, and select Clear Recent History. In the window that appears, set the time range to Everything, and then make sure that Cookies, Cache, and Browsing History are checked. Click the Clear Now button.
Remove the toolbar. Remove the MyStart search engine. Change your home page back. Reset your preferences. Delete your browser data.