Why does Firefox create so many temp files in cache? Once it filled up entire free HD space (46GB)?

Every now & then, Firefox will have created zillions of directories and files in Cache within the directory for a Firefox profile. The directories are called 0 (zero) through F (using the hex numbers as names, i.e.g), and within each of these will be more directories (with two digit hex names). The last time this happened (1 week ago), these directories ate up ALL of my free hard drive space (about 46 GB worth).
Why does this happen? Can I stop it from happening? If so, how?
THanks.

Yes it should be easy to reset.
It may be set from
* '''Options -> | Advanced | -> |Network| -> Cached Web Content''' <br /> [] Override automatic cache management
* see [[#w_cached-web-content]]'''_cached-web-content'''
Presumably your automatic setting has been overridden and the box needs unchecking.
I know Firefox does split the cache up like that IIRC it allows the cache to be faster and solves fragmentation issues.
46GB That seems a surprising amount and can not be right if it eats up all hard disk space. I also know that the file places.sqlite is a variable size, but that is based on the system in use.
The ordinary HTTP cache is also set presumably intelligently, but can be over-ridden by the user
This has some background info
* https://developer.mozilla.org/en-US/docs/HTTP_Caching_FAQ
*http://kb.mozillazine.org/Browser.cache.disk.capacity
My own settings as viewed in about:support are
browser.cache.disk.capacity 358400
browser.cache.disk.smart_size_cached_value 266240
browser.cache.disk.smart_size.first_run false
My cache use is limited to about 350MB

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