How to Enable Cookies in Firefox

Get internet cookies working in Firefox on iOS, Android, and desktop

A man about to enable cookies in the Firefox internet browser app on his smartphone.

TimeStopper / Moment

Mozilla's Firefox, like other internet browsers, collects cookies from websites to help remember your individual site preferences and save you time by keeping you logged in.

If a website keeps logging you out or continually forgets your settings, Firefox may have cookies disabled. Here's how to turn on cookies in the Firefox browser on iOS, Android, and desktop.

How to Turn on Cookies in Firefox on iOS

Screenshot of the Mozilla Firefox app on iOS showing steps on how to enable cookies
  1. Open the Firefox app on your iPhone, iPad, or iPod touch, then tap the three horizontal lines icon in the lower-right corner of the screen.

  2. Tap Settings.

  3. Tap Clear Private Data.

    Don't worry. Tapping this menu won't actually clear any data. It simply opens an options page where you can manage your data settings.

  4. On this next screen, if the switch next to Cookies is blue, this means cookies are enabled in your Mozilla Firefox app. If you ever want to disable cookies in Firefox, simply tap this switch.

Most internet browsers, including Mozilla Firefox, will have cookies enabled by default, so you likely won't have to enable them unless you or someone else has turned them off.

How to Enable Cookies in Firefox on Android

Screenshot of the Mozilla Firefox app on Android showing steps on how to enable cookies
  1. Open the Firefox app on your Android smartphone or tablet and tap the three dots in the upper-right corner of the screen. A menu should appear.

  2. From this menu, tap Settings.

  3. Tap Clear private data.

    Despite its name, this option won't clear data and will instead take you to another settings screen.

  4. On this next screen, make sure the box next to Cookies & active logins is checked. If it isn't, simply tap the box to place a checkmark and enable cookies.

How to Allow Cookies in Firefox on Desktop

Screenshot of the Mozilla Firefox app on Windows 10 showing steps on how to enable cookies
  1. Open the Mozilla Firefox internet browser on your Windows or Mac computer, then select the three horizontal lines icon in the top-right corner.

  2. Select Options.

  3. On the left side of the screen, you should see a settings menu with five options. Select Privacy & Security.

  4. Scroll down the next page until you get to Cookies and Site Data. If the option for Allow cookies and site data from websites (recommended) is checked, then cookies are already enabled in your Firefox browser. If it's not checked, select the option to turn cookies on.

To sync your cookie settings between Firefox apps on different devices, make sure you're logged in with the same Firefox account, then go to Menu > Options > Firefox Account and check the box next to Options.

What Happens When I Allow Cookies in Firefox?

When you enable cookies in Mozilla Firefox, the browser will begin to collect cookies automatically as you browse the web. The downloading of cookies happens completely in the background and won't interfere with your internet browsing experience.

Cookies are mainly used in three ways:

  • To keep you logged into a website so you don't have to sign in every time you visit it.
  • Some online advertising companies can use cookies to show you ads related to your browsing history.
  • Websites can use cookies to remember your personal preferences such as a color theme or which widgets you want to be displayed on a page.