Firefox Homepage and default search
1 - Open Firefox explore.
2 - Click “Firefox->Options->Options” open “Options” panel.
3 - Click “General” tab.
4 - Delete delta-homes homepage link and set a new homepage link. Or click "Restore to Default".
5 - Click "OK".
6 - Choose “Manage Search Engines” in the search list.
7 - Remove delta-homes,then click “OK”.
8 - Restart Firefox explore.
Firefox Newtab
1 - Open Firefox explore.
2 - Click "Firefox" then click "Add-ons" in the left-top of the page.
3 - Click "Extensions" in the left of the new page.
4 - Click "Remove" button of "Lightning Speed Dial".
5 - Restart Firefox explore,newtab add-on has been removed.
Firefox Shortcut
1 - Find the shortcut of the browser Firefox in all locations of the computer,including but not limited to the desktop.
2 - Right click and find the "Properties".
3 - Delete delta-homes in "Target" of the tab "Shortcut".