When using a web browser, like Firefox, it saves some information from its website to its cache and cookies. Clearing the cache can fix certain issues like long load times.
Clearing cache and cookies will remove settings that were previously in place. For example, if you were signed in to some websites, you will be required to sign back in on your next visit.
Firefox:
Open the Firefox web browser.
Click the Menu icon (three horizontal lines) at the upper right-hand corner.
Select Settings
Select Privacy and Security from the left menu bar
Scroll down to the Cookies and Site Data section
Click the Clear Data button
Select Cookies and Site Data
Select Cached Web Content
Click the Clear button
Close all tabs and try re-loading our website once more.
In general, you should notice an improvement in website load times and web browser performance.
Additional Info
Cookies are files that are created after visiting websites. They are designed to better your online experiences by saving browsing data, decreasing the amount of time it takes to load the pages in the future.
Caches are what remember certain elements of the pages you visit, for example, images, and help with the total amount of time it takes to reload these images on your next visit.