What is Firefox Klar for iOS?

This page describes some new features in Firefox Klar. If your Firefox Klar looks different, don't fret, you'll be able to get the new version soon.

Take private browsing to the next level. Firefox Klar gives you a dedicated privacy browser with tracking protection and content blocking. You can use Firefox Klar as a standalone browser or as content blocker for Safari on supported iPhone, iPad and iPod touch devices.

Install Firefox Klar

Firefox Klar is available in the App Store for free. When it’s finished downloading, look for the icon on your home screen.

Use Firefox Klar as a browser

Use Firefox Klar as a browser dedicated to your privacy and security. Easily erase your browsing history, passwords, bookmarks and cookies and prevent unwanted ads from following you.

  1. Whenever you want a private tracker-free experience, fire up Firefox Klar. Firefox Klar is easy to use. Just enter your search or website address in the field.
  2. To view a page in regular Firefox or to share it using another app, tap the share button at the bottom of the screen.
    focus share 3
  3. Erase all information about your session at any time by tapping the Erase button on the search field.
    erase focus

Use Firefox Klar with Safari

Enjoy protection against ad, social, content or analytics trackers without switching from Safari. Follow these steps to enable Firefox Klar for Safari:

Step one: allow Safari to use content blockers (you only need to do this once):

  1. Tap the Settings app in your iPhone or iPad.
  2. Scroll down to Safari and tap it.
  3. Tap Content Blockers.
  4. Tap the switch next to Firefox Klar to turn it on greenswitchfocus.
  5. Close the Settings app.

Step two: enable Firefox Klar for Safari

  1. Open Firefox Klar.
  2. Tap the settings gear at the top right corner.
    focus settings cog
  3. Tap the switch next to Safari to enable it blue switch.
  4. Close Firefox Klar. You’re ready to browse on Safari!

Customize your Firefox Klar protection settings

Customize the level of content blocking and tracking protection that you need.

Default search engine: to change your default search, see Change the default search in Firefox Klar on iOS.
  1. Open Firefox Klar.
  2. Tap the settings gear at the top right corner.
    focus settings cog
  3. Tap the switch next to each feature to turn it on or off.
    focus 3 settings
    Send anonymous usage data: We use general usage data to help us improve Firefox Klar. You can opt out of this at any time.
  4. Tap the back button or close Firefox Klar. Firefox Klar will save your changes automatically.

How does Firefox Klar work?


Firefox Klar brings added privacy by allowing you to block known website trackers by category:

  • Ads, analytics and social trackers
  • Other content trackers – this category includes embedded videos, photo slideshows, and news article embeds that could track you. Blocking other content trackers may cause many sites to stop functioning properly.
For Tracking Protection, Firefox Klar uses a list provided by Disconnect to identify and block trackers. You can read more about tracking and the standards Disconnect uses to create its list here.


Firefox Klar works by blocking some parts of web pages from loading. With less to download, web pages often load faster with Firefox Klar. Your mobile data usage may also be lower.

  • Web fonts - fonts that are downloaded from the server (may slow down web pages). Web fonts are typefaces used to style the text on some web pages. Blocking Web fonts will alter the appearance of text on any pages where Web fonts are used, but all text will still display legibly.


Firefox Klar is available in the iTunes store for supported devices. Content blocking is only available on 64-bit devices, iOS 9 and above including:

  • iPhone 5s and above
  • iPad Air and above
  • iPad mini 2 and above
  • iPod touch 6th Generation

Why aren't older Apple products supported?

Safari Content Blockers (which include Firefox Klar) are only available on devices with an A7 processor (64-bit) or later. Only 64-bit processors can handle the extra load of content blocking, which insures optimal performance. For example, since the iPad 3 has an A5 processor, Firefox Klar is incompatible.

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