@leocg Yes, I already understand. To blame. I just wanted to reduce the number of topics created and put it all in one.
As to why these proposals should be implemented. Because it is convenient and I believe that it will be better to use. Especially in the chrome source, the bookmarks bar works exactly as I described. Well, the file size in downloads is a very small thing, a trifle that you also want to see in the interface. All browsers display the size of already downloaded files in the download interface. Even in the same chromium source.
@doctorowl They are probably part of a page you've visited, that's why they are on the cache directory.
Do you have the start page with news enabled? maybe it could be related to the ads displayed there.