If there is a problem with the about:home Home page then try to reset the search engine used on the about:home page. Reset the browser.startup.homepage_override.mstone pref via the right-click context menu to the default on the about:config page and close and restart Firefox to restore the about:home page to its default. * Open the <b>about:config</b> page via the location bar * Type in the Filter bar: mstone * Right-click the browser.startup.homepage_override.mstone line and select: Reset * Close and restart Firefox If that didn't help then delete the delete the chromeappsstore.sqlite file in the Firefox Profile Folder and repeat the above.