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Recovering disk space

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With Thunderbird 115.1.1 (64-bit), are folders Cache and Cache.trash* still used?

With Thunderbird 115.1.1 (64-bit), are folders Cache and Cache.trash* still used?

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Yes. The interface is quite different, under the hood it is business as usual. You can clear the cache in the troubleshooting information if you want to free space used by it.