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Hi

Deleting that folder would be a really bad idea as it contains your bookmarks, passwords, browsing history, add-ons. This is part of the reason for the file size, but deleting it would not be a good thing to do.

Your screenshot shows the location for the cache folder (~/Library/Caches/Firefox/), so there is no reason not to cleanup this folder.

Firefox uses two locations for the Firefox profile folder. One location for your personal data (e.g. bookmarks) and another location for temporary files like the disk cache, so make sure to look in the correct location.

Location used for the main profile that keeps your personal data (Root Directory on about:profiles).

• ~/Library/Application Support/Firefox/Profiles/<profile>

Location used for the disk cache and other temporary files (Local Directory on about:profiles).

• ~/Library/Caches/Firefox/Profiles/<profile>