If I understand your comment, you did these steps:

1. Go to https://portal.dnb.de (js disabled by noscript)
2. Page redirects to url with sessionid https://portal.dnb.de/opac.htm;jsessionid=XXXX.prod-worker1?view=redirect%3A%2Fopac.htm&dodServiceUrl=https%3A%2F%2Fportal.dnb.de%2Fdod
3. Search "security" (without quotation)
4. https://portal.dnb.de/opac.htm;jsessionid=XXXX.prod-worker1?query=security&method=simpleSearch

I didn't do these following steps. Did you experience these?

5. Then you use TBB Torbutton "New Identity"
6. Go to https://portal.dnb.de (js disabled by noscript)
7. Page redirects to your search result https://portal.dnb.de/opac.htm;jsessionid=XXXX.prod-worker1?query=security&method=simpleSearch

Try this:
21. Create bookmark https://portal.dnb.de/ by pasting that into bookmarks toolbar.
22. Use TBB Torbutton "New Identity"
23. Load the bookmark into TBB blank tab

I think you will see https://portal.dnb.de/opac.htm;jsessionid=XXXX.prod-worker1?view=redirect%3A%2Fopac.htm&dodServiceUrl=https%3A%2F%2Fportal.dnb.de%2Fdod
with a new jsessionid value.

Redirecting to a new jsessionid url would how the page on that site is written to behave.

BTW, you have cookies disabled? As far as I know, "New Identity" flushes cookies, so I don't think allowing cookies setting should matter. But I disable cookies by default, so I don't know.

Note: I replaced the actual jsessionid that site gave me, with "XXXX"


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