What is cache and why should I clear it?

Each time you access a file through your web browser (Firefox, Chrome, etc.), the browser saves (i.e. caches) data it so it doesn't have to keep retrieving the same files or images from the web site each time you click Back or Forward. 

You should periodically clear your cache to allow your browser to function more efficiently. This is especially important when we update our browser-based Citywide systems in the SF Employee Portal. If you have not recently cleared your cache, you may experience performance issues, trouble logging into the SF Employee Portal, and/or may not see the enhancements from the PeopleSoft update.

The drawback to clearing your cache is that your saved usernames and passwords will be deleted, and you will be prompted to verify your identification through multi-factor authentication, even if you have opted to trust your device for 30 days. 

How do I clear my browser cache? 

Instructions below for Chrome, Firefox, Edge, and Safari browsers. As Microsoft no longer supports security updates for the Internet Explorer, please do not use Internet Explorer to access Citywide applications. 

Please contact your Department IT staff if you need assistance clearing your cache or installing Firefox or Chrome. 

Google Chrome 

1) Open your Chrome browser and click the menu (3 dots) in the top right corner

2) Select More tools

3) Click Clear browsing data (or use the keyboard shortcut Ctrl+Shift+Del to jump straight to step 4)

4) Click Advanced

5) For Time range, select All time

6) Select all items to ensure all data and files are cleared

7) Click Clear data

8) Under Privacy and security, click Site Settings

9) Click Cookies and site data

10) Turn on Clear cookies and site data when you quit Chrome to ensure your cache is cleared after each browser session


1) Open your Firefox browser and click the menu in the top right corner

2) Click Options (or Preferences)

3) Click Privacy & Security 

4) Under "Cookies and Site Data” click Clear Data…

5) Check Cookies and Site Data and Cached Web Content 

6) Click Clear

Microsoft Edge

1) Open your Edge browser and click the menu (3 dots) in the top right corner

2) Click History

3) Click Clear History 

4) Check Browsing History, Cookies and saved website data, Cached data and files, Tabs I've set aside or recently closed, and Download history

5) Click Clear 

6) Turn on Always clear this when I close the browser to ensure all data and files are cleared after each browser session.


1) Open your Safari browser and click the Safari drop down in the menu bar

2) Click Preferences

3) Click the Advanced icon 

4) Select Show Develop menu in the menu bar

5) Navigate back to Safari and click Develop in the menu bar

6) Click Empty Caches

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Safari on iPhone

1) Open your iPhone Settings

2) Click on Safari

3) Click on Clear History and Website Data

4) Click on Clear History and Data

Version/Update Date: Last Published by Mark Perlite on Thrusday, 30 April, 2020