Before you start
- Mozilla Firefox
Method 1 Firefox on a computer
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Step 1: Open Clear browsing data
Press Ctrl + Shift + Delete (Mac: Cmd + Shift + Delete), or go to Settings > Privacy & Security > Cookies and Site Data > Clear Data.
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Step 2: Choose time and items
Pick a time range and tick Cookies and site data and Temporary cached files and pages. Leave history unticked if you want to keep it.
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Step 3: Clear
Click Clear. You’ll be signed out of most websites.
Method 2 One website only
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Step 1: Open site info
On the site, click the padlock in the address bar.
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Step 2: Clear its data
Click Clear cookies and site data and confirm. Reload the page.
Method 3 Firefox on Android and iPhone
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Step 1: Open settings
Tap ⋮ (Android) or ☰ (iPhone) > Settings.
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Step 2: Delete browsing data
Android: Delete browsing data, tick Cookies and site data and Cached images and files, then Delete browsing data. iPhone: Data Management, choose items and tap Clear Private Data.
Troubleshooting
A site still behaves strangely
Try Firefox’s Troubleshoot Mode (Help > Troubleshoot Mode) to rule out add-ons.
Frequently asked questions
Will clearing cookies delete saved passwords?
No. Passwords are stored separately in about:logins.
How often should I clear the cache?
Only when sites misbehave or you need space.
Summary
Press Ctrl + Shift + Delete, tick Cookies and site data and cached files, and click Clear. Use the padlock menu to clear a single site.
