What is in the files of thunderbird cache

I use an app, CCleaner. One of the options is to delete the cache of Thunderbird. What is contained in these files and can they be deleted regularly and do not affect e-mail history and access?

I'm still not clear on what 'web' content could be associated with my email files?

I suppose you have heard of HTML email? A message can contain images dynamically loaded from a server, as opposed to the attached to the message.
Another example are the elements, which are essentially web pages to RSS feeds.

I understand the cache when related to Firefox

WRT hide Thunderbird is no different than Firefox.

When clearing the cache in Thunderbird files, what is affected?

Well, you clear the items being cached, which must then be recharged if you access once more. It's really the same thing with Firefox.
In case it helps to understand, Thunderbird has basically the same functionality built as a Firefox browsing web.

Tags: Thunderbird

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