UPDATE: eBayBuddy UK, The United Kingdom ebay extension is finally done! You can find it here. https://addons.mozilla.org/en-US/firefox/addon/11398
Coming Updates: customizable menus, customizable links, an option to open links in the same tab or a new one. Also a fix for the darker themes. If you use a dark theme and want the dark version, email me and I'll send it to you. Thanks for all the ideas! Keep them coming please! Also working on a Canadian and Italian version.
UPDATE: eBayBuddy Australia, The Australian ebay extension is finally done! You can find it here. https://addons.mozilla.org/en-US/firefox/addon/6280