The only time you should see document files or other downloads in a temp folder is if you are using Internet Explorer. All other browsers store all downloads in the downloads folder.
DOC files appearing in the temp directory from Internet downloads may be indicative of an issue, as generally Edge and IE only store files there if you click the option to run after a download.
ActiveX controls are the biggest vulnerability. JS files do get stored in the respective webrowsers appdata or the temporary directries. Try running CCleaner or another cleaning program or the disk cleanup utility to remove these files.
In short, it's "normal" but could be a security risk. Quick scans always check these directories if that says anything.