Most of the links in Tools -> My Bookmarks are not working. Most likely because the eBay link parameters has changed and the links have not been updated.
The links Search for Seller, Find Member, Members contact are not working. I know these are convenience links and can be found on eBay but they are useful to have (the first two links at least). The Search for Bidder is not possible since bidder names are hidden on eBay for a long time now.
Good catch. Thank you for letting me know about outdated link.
I updated all of them.
"Search for Bidder" helps if you need to see what a particular bidder bids on. You will still see the active items. I believe there are some restrictions for UK or German bidders where you can't see it.