Firefox 19 protects you from search engine changes, sort of
Sometimes when you install software on a Windows system you may end up with more than you have bargained for. I’m talking about toolbar installations and the changes they make to your operating system and web browsers that you use. This may include the installation of a toolbar in browsers such as Firefox or Internet Explorer, as well as the modification of the default search provider and home page.
Depending on the level of integration into the system, it may take a while to get things cleaned up again. It should not take you too long for instance to get Firefox cleaned up again if you are tech savvy, but regular users may find it difficult to change the search provider or home page to their previous values.