Clear the cache in Firefox
https://support.mozilla.org/en-US/kb/how-clear-firefox-cache
1Click the menu button and select Options. 2Select the Privacy & Security panel. 3In the Cookies and Site Data section, click Clear Data…. 4Remove the check mark in front of Cookies and Site Data. 5With Cached Web Content check marked, click the Clear button. 6 Close the about:preferences page. Any changes you've made will automatically be saved.
1Click the menu button and select Options.
2Select the Privacy & Security panel.
3In the Cookies and Site Data section, click Clear Data….
4Remove the check mark in front of Cookies and Site Data.
5With Cached Web Content check marked, click the Clear button.
6 Close the about:preferences page. Any changes you've made will automatically be saved.
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