What I want to achieve is:
after browsing the web page,all images on this page is downloaded to a specified directory.
Better with firefox because I'm using it.
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The firefox DownThemAll! allows you to selectively filter and fetch from a page.
This includes the ability to select by file type (extension).
you mean something like this: https://addons.mozilla.org/en-US/firefox/addon/2503 ??