有人说是chrome api的bug：
If there is any extension called chrome.downloads.onDeterminingFilename.addListener(callback), even if the callback function does nothing, the filename set by our extension (e.g. chrome.downloads.download({ url: "data:...", filename: "myname.jpg"})) will be lost and changed to 'download.jpg'.
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你之前说过升级 IDM 插件后就没问题了，现在又不行了吗？