Firefox is the best customizable browser thanks to its stellar options (with a dizzying array of features), speed, privacy and security. Firefox offers multiple search engines that are easy to use, great ways to organize tabs and a simple, easy-to-use interface. It isn't the fastest browser on the market, but is a solid choice for consumers whether they're using default settings or creating their own personalized browsing experience.
Fast, customizable and easy to use. While Firefox faces stiff competition from Google Chrome -- which has significantly boosted its features without compromising speed -- Mozilla's browser can be whatever you want it to be: A secure search engine; a private browser; a shopping center; a place to easily manage your tabs and research; a central hub for your browsing that can be used across devices. The options are endless. This is made possible thanks to Firefox's extensive add-ons (about 3.7 billion add-on and extension downloads and counting), customizable features and easy-to-access privacy settings. Is it the fastest? No. But this simply designed browser is by far the easiest to customize, and it offers privacy, security and browsing at a decent speed.ProsHighly customizable, Simple design, Strong privacy settingsConsSlower than leading competitors, Incompatible with Windows 8 touch-screen OS