I use firefox 56.0.2 (64 bit) and CCLeaner 5.36.6278 (64-bit) on Windows7 (64 bit) in German.
My problem: When I used CCLeaner yesterday to get rid of firefox cookies and internet cache (only), not only these, but EVERYTHING I had saved with the firefox pocket funktion was gone, too. This is devastating!!
I have ticked only three items, internet cache, cookies and last download place (German: Letzter Downloadort). No warning that the pocket data are as well deleted.