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All about Mozilla Firefox

About Mozilla Firefox

Mozilla Firefox

Firefox is a free Web browser created by Mozilla. It is notable for being completely open-source, meaning that anyone can obtain the source code and make their own version (like Orfox or Pale Moon), without paying a licensing fee.

Mozilla Firefox FAQs

While Firefox does not have the market share that it used to -- competing with browsers from Google, Microsoft, and Apple -- several features make it worth checking out. For example, you can choose a custom search engine, you can tell the browser how much cache space to use, and the mobile version will let you install extensions (though not all of them are compatible with mobile Firefox).

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  • Does Firefox mobile have browser extensions?
    Unlike Chrome or Safari, the Android version of Firefox will let you install many of the desktop version's add-ons, enabling things like ad blocking, Flash video downloading, and price-comparison checkers. So you can download videos over Wi-Fi and watch them later, or save yourself some money shopping. Firefox for iOS does not support extensions yet.
  • Can I use custom search engines?
    Google Chrome (the default browser on Android) and Safari (the default browser on iOS) have a shortlist of search engines you can choose from, while Firefox lets you add any search engine you want. Safari on iOS is especially limited: Google, Yahoo, Bing, and DuckDuckGo -- and Yahoo uses Bing under the hood, so your choices technically narrow to three. Firefox has a relatively long list of pre-recognized engines, plus you can long-tap in a search field on most webpages and add that search to your list. This will let you directly search the websites for services like iMDB, Steam, LinkedIn, the Google Play Store, or the iTunes store, without first having to open their respective apps or load their websites. This can save time and data. Unfortunately, however, Firefox on iOS does not yet support custom search.
  • Can I manage Firefox's storage space?
    The desktop version of Firefox lets you control how much space it uses to cache web pages. Once a page is cached, future loading of that page happen more quickly and use less data. To change this setting, click on the hamburger icon in the upper right (three stacked horizontal lines), select Options, go to the Advanced section at the bottom, check the box next to "Override automatic cache management," type your desired amount of space to use, and the change will be saved automatically. Of course, make sure that you're not giving Firefox more space than you have available on your device.

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Tom is the senior editor covering Windows at