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Try following scenario: 1) make a bugzilla query (search) containing arbitrary issues 2) save the link 3) modify an issue which is in the query result 4) open the link in your browser => you'll see the old version of the page (the modification is not taken into account) until you explicitly refresh the page in browser. You need to explicitly refresh any query page in the browser to be sure it contains proper data. The http caching policy in is apparently wrong. I use firefox 3.5
*** Bug 176779 has been marked as a duplicate of this bug. ***
So far, I've only seen the problem once with firefox:-( The problem was that BZ sometimes sends a strange MIME-type, especially for the server push setup used for the Mozilla browsers: multipart/x-mixed-replace. That was falling into the ExpiresDefault "access plus 30 days" for the web-tier boxes. I added ExpiresByType multipart/x-mixed-replace "access" and that seems to work.