1. Open Firefox developer tools.
  2. Search the HTML class name change-pic and delete it.
  3. Press C-S-c to re-pick the HTML element containing the image area.
  4. Select the parent HTML node of the currently focused node, which is something like <ul class="slide" data-v-f3680c6c="">.
  5. Press C-c to copy the HTML code of the node and save it to a file.

  6. Use a combination of several commands, grep, sed, xargs and wget, to extract image URLs and download all of them.

    grep -P -o '(?<=url\().*?(?=\))' album.html | sed "s/&quot;/\"/g" |sed "s/\/\//https:\/\//" | xargs wget

    N.B. In the pipe-concatenated commands above, grep uses the option -P to enable Perl compatible regular expressions. Its option -o will output only the matched patterns. In the regular expression (?<=url\().*?(?=\)), (?<=url\() is a positive look-behind assertion, while (?=\)) is a positive look-ahead assertion (reference). .*? matches any characters between a pair of brackets () in a non-greedy mode. The total effect of this regular expression is to extract the url from the string below.

    url(&quot;//ci.xiaohongshu.com/8f9e2cf5-ea58-ef7f-b3bb-65e8ede2798c?imageView2/2/w/1080/format/jpg&quot;)

    sed first replaces HTML quote &quot; with " and then // with https://. Finally, xargs passes each line of extracted URL to wget which downloads the image.