I can't reproduce this on my Windows 10. After modifying the UA, I can still see cache size increases when you check `Clear Data`, which is under `about:preferences`. Where did you observe the cache size? Do you see any size increasing when you click `Clear Data`? Do you see cache size changing when watching videos on other sites? Thank you.
Bug 1779884 Comment 2 Edit History
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I can't reproduce this on my Windows 10. After modifying the UA, I can still see cache size increasing when I check `Clear Data`, which is under `about:preferences`. Where did you observe the cache size? Do you see any size increasing when you click `Clear Data`? Do you see cache size changing when watching videos on other sites? Thank you.