Hello, you can find firefox cache by going to your profile saved in C Drive. C:\Users\(username)\AppData\Local\Mozilla\Firefox\Profiles\5qnsvrun.default\Cache

Firefox normally manages the size of it's cache, and can cache more or less information depending on various factors.

You can manage your firefox cache buy this ad-on https://addons.mozilla.org/en-us/firefox/addon/cache-status/

hope this answers your question

You can type about:cache in Location (address) bar to view your Cache and where it is located.