The purpose of reloading web page(s) and bypass the cache is to get a fresh copy of possibly outdated or corrupted files currently stored in the disk cache. You can do this as the first attempt if a normal reload doesn't seem to be giving an up to date version of a website or if you otherwise experience issues with a website. We usually advice this in case of issues:
Reload web page(s) and bypass the cache to refresh possibly outdated or corrupted files.
Hold down the Shift key and left-click the Reload button Press "Ctrl + F5" or press "Ctrl + Shift + R" (Windows,Linux) Press "Command + Shift + R" (Mac)
Clear the cache and remove cookies only from websites that cause problems. “Clear the Cache”:
Firefox/Tools > Options > Advanced > Network > Cached Web Content: "Clear Now"
“Remove Cookies” from sites causing problems:
Firefox/Tools > Options > Privacy > "Use custom settings for history" > Cookies: "Show Cookies"
Start Firefox in Safe Mode to check if an extension or theme (Firefox/Tools > Add-ons > Extensions) or if hardware acceleration is causing problems.