To clear all cookies, site data and cache, please follow steps as below.
Please see these articles to clear cache and cookies in other browsers:
Clear Cache and Cookies in Google Chrome
Clear Cache and Cookies in Internet Explorer
- Open Firefox
- Click menu button on the top right and select Settings
- Click Privacy & Security and go to the Cookies and Site Data section.
- Click Clear data... button, the Clear Data dialog will appear
- Click Clear
Please see these articles to clear cache and cookies in other browsers:
Clear Cache and Cookies in Google Chrome
Clear Cache and Cookies in Internet Explorer