Confirming a problem on the trunk 20020930 -- but I don't know whether it's a mozilla problem or a website problem. If you are the website designer, could you check and see whether mozilla is posting the proper pair btnShopMore=MORE when you click the "Shop More" button? I will try to test it on my local server when I get a chance.
It is posting btnShopMore=MORE in addition to the button coordinates since the button is an image. We're checking for the coordinate as well as the value. I'm going to look into removing the 'MORE' value from the button to see if that helps as the Delete and Edit buttons do work on that page, but don't have value attributes.
I don't know how much control you have over that server, but it would help if you had access to the web logs, and these contained the full HTTP POST information: submit the form using a browser that works (NS6.x, IE)... then under the same conditions submit the form using a new mozilla build or NS7. Check the logs to see how the HTTP POSTdata differs.
Looks like dupe of 162902 *** This bug has been marked as a duplicate of 162902 ***